GN: Exclude suppressions of Chromium Clang warnings for Chromium builds.

These suppressions are causing GN errors when Chromium targets are depending
directly on WebRTC targets (needed for https://codereview.chromium.org/2413103004)

BUG=webrtc:4256
NOTRY=True

Review-Url: https://codereview.webrtc.org/2408133008
Cr-Commit-Position: refs/heads/master@{#14644}
diff --git a/webrtc/video/BUILD.gn b/webrtc/video/BUILD.gn
index 156c49a..863f2f5 100644
--- a/webrtc/video/BUILD.gn
+++ b/webrtc/video/BUILD.gn
@@ -48,9 +48,8 @@
     "vie_remb.h",
   ]
 
-  if (is_clang) {
-    # Suppress warnings from Chrome's Clang plugins.
-    # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
+  if (!build_with_chromium && is_clang) {
+    # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 
@@ -99,9 +98,8 @@
       "//testing/gmock",
       "//testing/gtest",
     ]
-    if (is_clang) {
-      # Suppress warnings from the Chromium Clang plugin.
-      # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
+    if (!build_with_chromium && is_clang) {
+      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }