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

media/video/capture/video_capture_device_factory.cc

Index: media/video/capture/video_capture_device_factory.cc
diff --git a/media/video/capture/video_capture_device_factory.cc b/media/video/capture/video_capture_device_factory.cc
index 73888e0b1d650d257446e865e363e4595d841388..c87c39a11b58d8acd24839648c42f07b8bf6eca6 100644
--- a/media/video/capture/video_capture_device_factory.cc
+++ b/media/video/capture/video_capture_device_factory.cc
@@ -14,7 +14,8 @@ namespace media {
 // static
 scoped_ptr<VideoCaptureDeviceFactory> VideoCaptureDeviceFactory::CreateFactory(
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
-  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
   // Use a Fake or File Video Device Factory if the command line flags are
   // present, otherwise use the normal, platform-dependent, device factory.
   if (command_line->HasSwitch(switches::kUseFakeDeviceForMediaStream)) {