components: Cleanup class/struct fwd declarations

components/test_runner/mock_credential_manager_client.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 COMPONENTS_TEST_RUNNER_MOCK_CREDENTIAL_MANAGER_CLIENT_H_
 #define COMPONENTS_TEST_RUNNER_MOCK_CREDENTIAL_MANAGER_CLIENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "third_party/WebKit/public/platform/WebCredentialManagerClient.h"
 #include "third_party/WebKit/public/platform/WebCredentialManagerError.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 
 namespace blink {
 class WebCredential;
-class WebFrame;
 class WebURL;
 }
 
 namespace test_runner {
 
 class MockCredentialManagerClient : public blink::WebCredentialManagerClient {
  public:
   MockCredentialManagerClient();
   virtual ~MockCredentialManagerClient();
 
@@ skipping 13 matching lines @@
  private:
   std::unique_ptr<blink::WebCredential> credential_;
   blink::WebCredentialManagerError error_;
 
   DISALLOW_COPY_AND_ASSIGN(MockCredentialManagerClient);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_MOCK_CREDENTIAL_MANAGER_CLIENT_H_