[android_webview] Hardcode the default text encoding to UTF-8.

android_webview/renderer/aw_content_renderer_client.h

 // Copyright 2012 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 ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_
 
 #include "content/public/renderer/content_renderer_client.h"
 
 #include "android_webview/renderer/aw_render_process_observer.h"
 #include "base/compiler_specific.h"
 
 namespace visitedlink {
 class VisitedLinkSlave;
 }
 
 namespace android_webview {
 
 class AwContentRendererClient : public content::ContentRendererClient {
  public:
   AwContentRendererClient();
   virtual ~AwContentRendererClient();
 
   // ContentRendererClient implementation.
   virtual void RenderThreadStarted() override;
   virtual void RenderFrameCreated(content::RenderFrame* render_frame) override;
   virtual void RenderViewCreated(content::RenderView* render_view) override;
-  virtual std::string GetDefaultEncoding() override;
   virtual bool HasErrorPage(int http_status_code,
                             std::string* error_domain) override;
   virtual void GetNavigationErrorStrings(
       content::RenderView* render_view,
       blink::WebFrame* frame,
       const blink::WebURLRequest& failed_request,
       const blink::WebURLError& error,
       std::string* error_html,
       base::string16* error_description) override;
   virtual unsigned long long VisitedLinkHash(const char* canonical_url,
@@ skipping 15 matching lines @@
       blink::WebPageVisibilityState* override_state) override;
 
  private:
   scoped_ptr<AwRenderProcessObserver> aw_render_process_observer_;
   scoped_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_RENDERER_AW_CONTENT_RENDERER_CLIENT_H_