Make ScreenCastPortal::CaptureSourceType private

https://crrev.com/c/3885576 removed the last downstream consumer of the
constructor which took a ScreenCastPortal::CaptureSourceType. Now that
it has been removed, that constructor definition can also be removed and
the CaptureSourceType enum can be made private. There's still benefit in
storing and using this internally as the enum, since it's values match
that of the underlying system API.

The previously anonymous-namespaced function |ToCaptureSourceType| had
to be converted to a private static method as part of this change, since
it would be unable to access the type otherwise.

Fixed: chromium:1359411
Change-Id: I81ff24fbdddf9db02c9c5152d007dd82c194865a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/274680
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Mark Foltz <mfoltz@chromium.org>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#38084}
diff --git a/modules/desktop_capture/linux/wayland/screencast_portal.cc b/modules/desktop_capture/linux/wayland/screencast_portal.cc
index 5eacae9..f9cdb08 100644
--- a/modules/desktop_capture/linux/wayland/screencast_portal.cc
+++ b/modules/desktop_capture/linux/wayland/screencast_portal.cc
@@ -31,7 +31,11 @@
 using xdg_portal::TearDownSession;
 using xdg_portal::RequestResponseFromPortalResponse;
 
-ScreenCastPortal::CaptureSourceType ToCaptureSourceType(CaptureType type) {
+}  // namespace
+
+// static
+ScreenCastPortal::CaptureSourceType ScreenCastPortal::ToCaptureSourceType(
+    CaptureType type) {
   switch (type) {
     case CaptureType::kScreen:
       return ScreenCastPortal::CaptureSourceType::kScreen;
@@ -40,22 +44,6 @@
   }
 }
 
-// TODO(https://crbug.com/1359411): Migrate downstream consumers off of
-// CaptureSourceType and delete this.
-CaptureType ToCaptureType(ScreenCastPortal::CaptureSourceType source_type) {
-  switch (source_type) {
-    case ScreenCastPortal::CaptureSourceType::kScreen:
-      return CaptureType::kScreen;
-    case ScreenCastPortal::CaptureSourceType::kWindow:
-      return CaptureType::kWindow;
-    default:
-      RTC_DCHECK_NOTREACHED();
-      return CaptureType::kScreen;
-  }
-}
-
-}  // namespace
-
 ScreenCastPortal::ScreenCastPortal(CaptureType type, PortalNotifier* notifier)
     : ScreenCastPortal(type,
                        notifier,
@@ -76,18 +64,6 @@
           sources_request_response_signal_handler),
       user_data_(user_data) {}
 
-ScreenCastPortal::ScreenCastPortal(
-    CaptureSourceType source_type,
-    PortalNotifier* notifier,
-    ProxyRequestResponseHandler proxy_request_response_handler,
-    SourcesRequestResponseSignalHandler sources_request_response_signal_handler,
-    gpointer user_data)
-    : ScreenCastPortal(ToCaptureType(source_type),
-                       notifier,
-                       proxy_request_response_handler,
-                       sources_request_response_signal_handler,
-                       user_data) {}
-
 ScreenCastPortal::~ScreenCastPortal() {
   Stop();
 }
diff --git a/modules/desktop_capture/linux/wayland/screencast_portal.h b/modules/desktop_capture/linux/wayland/screencast_portal.h
index 65869e6..96e4ba3 100644
--- a/modules/desktop_capture/linux/wayland/screencast_portal.h
+++ b/modules/desktop_capture/linux/wayland/screencast_portal.h
@@ -38,16 +38,6 @@
                GVariant* parameters,
                gpointer user_data);
 
-  // Values are set based on source type property in
-  // xdg-desktop-portal/screencast
-  // https://github.com/flatpak/xdg-desktop-portal/blob/master/data/org.freedesktop.portal.ScreenCast.xml
-  // TODO(https://crbug.com/1359411): Make this private.
-  enum class CaptureSourceType : uint32_t {
-    kScreen = 0b01,
-    kWindow = 0b10,
-    kAnyScreenContent = kScreen | kWindow
-  };
-
   // Values are set based on cursor mode property in
   // xdg-desktop-portal/screencast
   // https://github.com/flatpak/xdg-desktop-portal/blob/master/data/org.freedesktop.portal.ScreenCast.xml
@@ -96,14 +86,6 @@
                        sources_request_response_signal_handler,
                    gpointer user_data);
 
-  // TODO(https://crbug.com/1359411): Migrate downstream consumers off of
-  // CaptureSourceType and delete this.
-  ScreenCastPortal(CaptureSourceType source_type,
-                   PortalNotifier* notifier,
-                   ProxyRequestResponseHandler proxy_request_response_handler,
-                   SourcesRequestResponseSignalHandler
-                       sources_request_response_signal_handler,
-                   gpointer user_data);
   ~ScreenCastPortal();
 
   // Initialize ScreenCastPortal with series of DBus calls where we try to
@@ -136,6 +118,16 @@
   std::string RestoreToken() const;
 
  private:
+  // Values are set based on source type property in
+  // xdg-desktop-portal/screencast
+  // https://github.com/flatpak/xdg-desktop-portal/blob/master/data/org.freedesktop.portal.ScreenCast.xml
+  enum class CaptureSourceType : uint32_t {
+    kScreen = 0b01,
+    kWindow = 0b10,
+    kAnyScreenContent = kScreen | kWindow
+  };
+  static CaptureSourceType ToCaptureSourceType(CaptureType type);
+
   PortalNotifier* notifier_;
 
   // A PipeWire stream ID of stream we will be connecting to