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

content/test/webrtc_content_browsertest_base.cc

Index: content/test/webrtc_content_browsertest_base.cc
diff --git a/content/test/webrtc_content_browsertest_base.cc b/content/test/webrtc_content_browsertest_base.cc
index 252cd2595c573eb9bf54a7826bb25f9ddab67d98..b3eb0c437ef298dae662512367f1720239bcc5d1 100644
--- a/content/test/webrtc_content_browsertest_base.cc
+++ b/content/test/webrtc_content_browsertest_base.cc
@@ -23,16 +23,17 @@
 
 namespace content {
 
-void WebRtcContentBrowserTest::SetUpCommandLine(CommandLine* command_line) {
+void WebRtcContentBrowserTest::SetUpCommandLine(
+    base::CommandLine* command_line) {
   // 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));
 
   // Always include loopback interface in network list, in case the test device
   // doesn't have other interfaces available.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kAllowLoopbackInPeerConnection);
 }