Extract content dependency from keyboard code

ui/keyboard/keyboard_util.h

Index: ui/keyboard/keyboard_util.h
diff --git a/ui/keyboard/keyboard_util.h b/ui/keyboard/keyboard_util.h
index 55621b53897d988cfd04262f1997b12b8a1661f8..2eefc9b02d69e4962ba86066fde314e0dd67675a 100644
--- a/ui/keyboard/keyboard_util.h
+++ b/ui/keyboard/keyboard_util.h
@@ -7,13 +7,10 @@
 
 #include <string>
 
-#include "base/strings/string16.h"
 // TODO(beng): replace with forward decl once RootWindow is renamed.
 #include "ui/aura/window.h"
 #include "ui/keyboard/keyboard_export.h"
 
-struct GritResourceMap;
-
 namespace aura {
 class WindowTreeHost;
 }
@@ -162,11 +159,6 @@ KEYBOARD_EXPORT void MarkKeyboardLoadStarted();
 // keyboard is loaded.
 KEYBOARD_EXPORT void MarkKeyboardLoadFinished();
 
-// Get the list of keyboard resources. |size| is populated with the number of
-// resources in the returned array.
-KEYBOARD_EXPORT const GritResourceMap* GetKeyboardExtensionResources(
-    size_t* size);
-
 // Sets the override content url.
 // This is used by for input view for extension IMEs.
 KEYBOARD_EXPORT void SetOverrideContentUrl(const GURL& url);