Fix a crash when saving a <canvas> or <img> image which is large.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index b89778527ff85dae53d9b7b67ec4ce9a0ce7f519..ab7e1fc846c2ced36b5b4e387341df8ecb3e6817 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -186,11 +186,19 @@ class RenderMessageFilter : public BrowserMessageFilter {
   void OnOpenChannelToPpapiBroker(int routing_id,
                                   const base::FilePath& path);
   void OnGenerateRoutingID(int* route_id);
+  void DownloadUrl(int render_view_id,
+                   const GURL& url,
+                   const Referrer& referrer,
+                   const base::string16& suggested_name,
+                   const bool use_prompt);
   void OnDownloadUrl(int render_view_id,
                      const GURL& url,
                      const Referrer& referrer,
-                     const base::string16& suggested_name,
-                     const bool use_prompt);
+                     const base::string16& suggested_name);
+  void OnSaveImageAs(int render_view_id,
+                     const std::string& encoded_image_data,
+                     const Referrer& referrer,
+                     const base::string16& suggested_name);
   void OnCheckNotificationPermission(const GURL& source_origin,
                                      int* permission_level);