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

content/renderer/android/synchronous_compositor_factory.cc

Index: content/renderer/android/synchronous_compositor_factory.cc
diff --git a/content/renderer/android/synchronous_compositor_factory.cc b/content/renderer/android/synchronous_compositor_factory.cc
index 7238b710dfcaf4ba83605b12a8c3a12f3c0a5d74..b6093e7e9d6dc3ea264ee471467ec71852d86674 100644
--- a/content/renderer/android/synchronous_compositor_factory.cc
+++ b/content/renderer/android/synchronous_compositor_factory.cc
@@ -20,7 +20,8 @@ void SynchronousCompositorFactory::SetInstance(
   DCHECK(g_instance == NULL);
 
   // This feature only makes sense in single process mode.
-  CHECK(CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess));
+  CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSingleProcess));
 
   g_instance = instance;
 }