Make callers of CommandLine use it via the base:: namespace.

media/video/capture/file_video_capture_device_factory.cc

Index: media/video/capture/file_video_capture_device_factory.cc
diff --git a/media/video/capture/file_video_capture_device_factory.cc b/media/video/capture/file_video_capture_device_factory.cc
index 8edcb4e4d81c7e6961b3f095a9576473bcfa5819..4749c2f8a976b3d9bd9db7fdad57f8466a2e4863 100644
--- a/media/video/capture/file_video_capture_device_factory.cc
+++ b/media/video/capture/file_video_capture_device_factory.cc
@@ -18,7 +18,7 @@ const char kFileVideoCaptureDeviceName[] =
 // Inspects the command line and retrieves the file path parameter.
 base::FilePath GetFilePathFromCommandLine() {
   base::FilePath command_line_file_path =
-      CommandLine::ForCurrentProcess()->GetSwitchValuePath(
+      base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
           switches::kUseFileForFakeVideoCapture);
   CHECK(!command_line_file_path.empty());
   return command_line_file_path;