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

content/shell/renderer/layout_test/layout_test_render_process_observer.cc

Index: content/shell/renderer/layout_test/layout_test_render_process_observer.cc
diff --git a/content/shell/renderer/layout_test/layout_test_render_process_observer.cc b/content/shell/renderer/layout_test/layout_test_render_process_observer.cc
index 31373acf517f5f0d95c37342b67d5204faef97c1..04d4d38bd5ab0eab0bb721334f06021f56bae054 100644
--- a/content/shell/renderer/layout_test/layout_test_render_process_observer.cc
+++ b/content/shell/renderer/layout_test/layout_test_render_process_observer.cc
@@ -63,8 +63,8 @@ void LayoutTestRenderProcessObserver::WebKitInitialized() {
   std::string flags("--expose-gc");
   v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
 
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-    switches::kStableReleaseMode)) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kStableReleaseMode)) {
     WebRuntimeFeatures::enableTestOnlyFeatures(true);
   }