Move remaining files in content\browser\renderer_host to content namespace.

content/browser/renderer_host/gtk_key_bindings_handler.cc

Index: content/browser/renderer_host/gtk_key_bindings_handler.cc
===================================================================
--- content/browser/renderer_host/gtk_key_bindings_handler.cc	(revision 164665)
+++ content/browser/renderer_host/gtk_key_bindings_handler.cc	(working copy)
@@ -12,9 +12,7 @@
 #include "base/string_util.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 
-using content::EditCommand;
-using content::EditCommands;
-using content::NativeWebKeyboardEvent;
+namespace content {
 
 GtkKeyBindingsHandler::GtkKeyBindingsHandler(GtkWidget* parent_widget)
     : handler_(CreateNewHandler()) {
@@ -290,3 +288,5 @@
                                       GtkDirectionType arg1) {
   // Just for disabling the default handler.
 }
+
+}  // namespace content