GN: Fix windows clang errors. Attempt 2.

webrtc/modules/video_capture/BUILD.gn

Index: webrtc/modules/video_capture/BUILD.gn
diff --git a/webrtc/modules/video_capture/BUILD.gn b/webrtc/modules/video_capture/BUILD.gn
index 8edac8941a1afcc45cfcd2919a6a4077db0ec175..0875ed8ea60a85d832bbc6cb1cf10c99d815e5dc 100644
--- a/webrtc/modules/video_capture/BUILD.gn
+++ b/webrtc/modules/video_capture/BUILD.gn
@@ -76,7 +76,27 @@ if (!build_with_chromium) {
     }
   }
 
+  config("video_capture_internal_impl_warnings_config") {
+    if (is_win && is_clang) {
+      cflags = [
+        "-Wno-comment",
+        "-Wno-ignored-attributes",
+
+        # See https://bugs.chromium.org/p/webrtc/issues/detail?id=6269
+        # for -Wno-ignored-qualifiers
+        "-Wno-ignored-qualifiers",
+        "-Wno-microsoft-extra-qualification",
+        "-Wno-missing-braces",
+        "-Wno-overloaded-virtual",
+        "-Wno-reorder",
+        "-Wno-writable-strings",
+      ]
+    }
+  }
+
   source_set("video_capture_internal_impl") {
+    configs += [ ":video_capture_internal_impl_warnings_config" ]
+
     deps = [
       ":video_capture_module",
       "../../system_wrappers",
@@ -136,17 +156,6 @@ if (!build_with_chromium) {
 
       deps += [ "//third_party/winsdk_samples" ]
     }
-    if (is_win && is_clang) {
-      cflags = [
-        "-Wno-comment",
-        "-Wno-ignored-attributes",
-        "-Wno-microsoft-extra-qualification",
-        "-Wno-missing-braces",
-        "-Wno-overloaded-virtual",
-        "-Wno-reorder",
-        "-Wno-writable-strings",
-      ]
-    }
     if (is_ios) {
       sources = [
         "ios/device_info_ios.h",