Move CommandLine to base namespace.

mojo/shell/child_process.h

Index: mojo/shell/child_process.h
diff --git a/mojo/shell/child_process.h b/mojo/shell/child_process.h
index e5ce65a81cc8fc213d29771f0b8c1368e169f20c..0e5ba0b8cb3fbbd772dac626f1f1b95535e053c1 100644
--- a/mojo/shell/child_process.h
+++ b/mojo/shell/child_process.h
@@ -9,7 +9,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "mojo/system/embedder/scoped_platform_handle.h"
 
+namespace base {
 class CommandLine;
+}
 
 namespace mojo {
 namespace shell {
@@ -26,7 +28,7 @@ class ChildProcess {
   // Returns null if the command line doesn't indicate that this is a child
   // process. |main()| should call this, and if it returns non-null it should
   // call |Run()| inside a main message loop.
-  static scoped_ptr<ChildProcess> Create(const CommandLine& command_line);
+  static scoped_ptr<ChildProcess> Create(const base::CommandLine& command_line);
 
   void Run();