Remove PushPermissionClient.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index d88668805539732f8520d875a0a14e201563e218..9f15bff83321ff276d83b2cfe2734ae603dd65cc 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -57,7 +57,6 @@ namespace blink {
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
 class WebCachedURLRequest;
-class WebCallback;
 class WebColorChooser;
 class WebColorChooserClient;
 class WebContentDecryptionModule;
@@ -337,10 +336,6 @@ public:
 
     // Push API ---------------------------------------------------
 
-    // Requests permission to use the Push API in the origin of this frame.
-    // FIXME: Merge this into WebPushClient as it's not going away as originally planned.
-    virtual void requestPushPermission(WebCallback* callback) { }
-
     // Used to access the embedder for the Push API.
     virtual WebPushClient* pushClient() { return 0; }