<webview> Implement clear http cache API.

extensions/browser/guest_view/web_view/web_view_guest.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 EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 225 matching lines @@
   // Clears data in the storage partition of this guest.
   //
   // Partition data that are newer than |removal_since| will be removed.
   // |removal_mask| corresponds to bitmask in StoragePartition::RemoveDataMask.
   bool ClearData(const base::Time remove_since,
                  uint32 removal_mask,
                  const base::Closure& callback);
 
   ScriptExecutor* script_executor() { return script_executor_.get(); }
 
+  scoped_ptr<WebViewGuestDelegate> SetDelegateForTesting(
+      scoped_ptr<WebViewGuestDelegate> delegate) {
+    web_view_guest_delegate_.swap(delegate);
+    return delegate.Pass();
+  }
+
  private:
   friend class WebViewPermissionHelper;
 
   explicit WebViewGuest(content::WebContents* owner_web_contents);
 
   ~WebViewGuest() override;
 
   void AttachWebViewHelpers(content::WebContents* contents);
 
+  void ClearDataInternal(const base::Time remove_since,
+                         uint32 removal_mask,
+                         const base::Closure& callback);
+
   void OnWebViewNewWindowResponse(int new_window_instance_id,
                                   bool allow,
                                   const std::string& user_input);
 
   void OnFullscreenPermissionDecided(bool allowed,
                                      const std::string& user_input);
   bool GuestMadeEmbedderFullscreen() const;
   void SetFullscreenState(bool is_fullscreen);
 
   // WebContentsObserver implementation.
@@ skipping 122 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<WebViewGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_