Clean up forward declarations in Source/modules

Source/modules/credentialmanager/CredentialManagerClient.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CredentialManagerClient_h
 #define CredentialManagerClient_h
 
 #include "platform/Supplementable.h"
 #include "public/platform/WebCredentialManagerClient.h"
 #include "public/platform/WebVector.h"
 
 namespace blink {
 
 class ExecutionContext;
-class KURL;
 class Page;
 class WebCredential;
 class WebURL;
 
 // CredentialManagerClient lives as a supplement to Page, and wraps the embedder-provided
 // WebCredentialManagerClient's methods to make them visible to the bindings code.
 class CredentialManagerClient final : public NoBaseWillBeGarbageCollectedFinalized<CredentialManagerClient>, public WillBeHeapSupplement<Page> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CredentialManagerClient);
 public:
     explicit CredentialManagerClient(WebCredentialManagerClient*);
@@ skipping 12 matching lines @@
 
 private:
     WebCredentialManagerClient* m_client;
 };
 
 void provideCredentialManagerClientTo(Page&, CredentialManagerClient*);
 
 } // namespace blink
 
 #endif // CredentialManagerClient_h