Fix some chromium-style warnings in webrtc/modules/desktop_capture/

BUG=163
R=sergeyu@chromium.org

Review URL: https://webrtc-codereview.appspot.com/1904004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4446 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/desktop_capture/desktop_region.cc b/modules/desktop_capture/desktop_region.cc
index eb83fde..fff0c8c 100644
--- a/modules/desktop_capture/desktop_region.cc
+++ b/modules/desktop_capture/desktop_region.cc
@@ -23,6 +23,8 @@
     : top(top), bottom(bottom) {
 }
 
+DesktopRegion::Row::~Row() {}
+
 DesktopRegion::DesktopRegion() {}
 
 DesktopRegion::DesktopRegion(const DesktopRect& rect) {
diff --git a/modules/desktop_capture/desktop_region.h b/modules/desktop_capture/desktop_region.h
index 403f2c2..04ea5e1 100644
--- a/modules/desktop_capture/desktop_region.h
+++ b/modules/desktop_capture/desktop_region.h
@@ -48,6 +48,7 @@
   // have the same vertical position.
   struct Row {
     Row(int32_t top, int32_t bottom);
+    ~Row();
 
     int32_t top;
     int32_t bottom;