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

chrome/browser/media/chrome_media_stream_infobar_browsertest.cc

Index: chrome/browser/media/chrome_media_stream_infobar_browsertest.cc
diff --git a/chrome/browser/media/chrome_media_stream_infobar_browsertest.cc b/chrome/browser/media/chrome_media_stream_infobar_browsertest.cc
index ec435fb8b5be1f41157f13326a6e49828ec1c16a..d06a595e620c1fcd22d1e7351bc52e147060a0db 100644
--- a/chrome/browser/media/chrome_media_stream_infobar_browsertest.cc
+++ b/chrome/browser/media/chrome_media_stream_infobar_browsertest.cc
@@ -36,7 +36,7 @@ class MediaStreamInfoBarTest : public WebRtcTestBase {
   ~MediaStreamInfoBarTest() override {}
 
   // InProcessBrowserTest:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     // This test expects to run with fake devices but real UI.
     command_line->AppendSwitch(switches::kUseFakeDeviceForMediaStream);
     EXPECT_FALSE(command_line->HasSwitch(switches::kUseFakeUIForMediaStream))
@@ -128,7 +128,8 @@ IN_PROC_BROWSER_TEST_F(MediaStreamInfoBarTest,
                        TestAcceptThenDenyWhichShouldBeSticky) {
 #if defined(OS_WIN) && defined(USE_ASH)
   // Disable this test in Metro+Ash for now (http://crbug.com/262796).
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kAshBrowserTests))
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshBrowserTests))
     return;
 #endif