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

content/browser/media/webrtc_internals_browsertest.cc

Index: content/browser/media/webrtc_internals_browsertest.cc
diff --git a/content/browser/media/webrtc_internals_browsertest.cc b/content/browser/media/webrtc_internals_browsertest.cc
index e9f1e6114074d83856b173825e5b48214b4e3fae..05c42ccae7bb4ea432d794e5b8480100859f0258 100644
--- a/content/browser/media/webrtc_internals_browsertest.cc
+++ b/content/browser/media/webrtc_internals_browsertest.cc
@@ -153,9 +153,9 @@ class MAYBE_WebRtcInternalsBrowserTest: public ContentBrowserTest {
 
   void SetUpOnMainThread() override {
     // Assume this is set by the content test launcher.
-    ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
+    ASSERT_TRUE(base::CommandLine::ForCurrentProcess()->HasSwitch(
         switches::kUseFakeUIForMediaStream));
-    ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
+    ASSERT_TRUE(base::CommandLine::ForCurrentProcess()->HasSwitch(
         switches::kUseFakeDeviceForMediaStream));
   }