Move clear cache code from chrome/ (ChromeWVGDelegate) to extensions/ (WVGuest)

extensions/browser/guest_view/web_view/web_view_guest_delegate.h

Index: extensions/browser/guest_view/web_view/web_view_guest_delegate.h
diff --git a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
index 7b1dd56bf47b61292fce85bc5dc7539e021e6d43..473ffd3d754c3f6d323e90b0d11e606f07c85853 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
+++ b/extensions/browser/guest_view/web_view/web_view_guest_delegate.h
@@ -32,10 +32,6 @@ class WebViewGuestDelegate {
   typedef std::vector<linked_ptr<api::web_view_internal::ContextMenuItem> >
       MenuItemVector;
 
-  // Clears http cache for this guest's StoragePartition.
-  virtual void ClearCache(base::Time remove_since,
-                          const base::Closure& callback) = 0;
-
   // Called when context menu operation was handled.
   virtual bool HandleContextMenu(const content::ContextMenuParams& params) = 0;