Move sandbox code in content to content namespace.

content/test/content_test_launcher.cc

Index: content/test/content_test_launcher.cc
===================================================================
--- content/test/content_test_launcher.cc	(revision 163460)
+++ content/test/content_test_launcher.cc	(working copy)
@@ -85,7 +85,7 @@
   DISALLOW_COPY_AND_ASSIGN(ContentBrowserTestSuite);
 };
 
-class ContentTestLauncherDelegate : public test_launcher::TestLauncherDelegate {
+class ContentTestLauncherDelegate : public TestLauncherDelegate {
  public:
   ContentTestLauncherDelegate() {}
   virtual ~ContentTestLauncherDelegate() {}
@@ -122,5 +122,5 @@
   media_stream::MediaStreamManager::AlwaysUseFakeDevice();
 
   content::ContentTestLauncherDelegate launcher_delegate;
-  return test_launcher::LaunchTests(&launcher_delegate, argc, argv);
+  return LaunchTests(&launcher_delegate, argc, argv);
 }