Make browser_handles_top_level_requests synchronous.

content/common/view_messages.h

 // Copyright (c) 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1596 matching lines @@
                            bool         /* out - success */,
                            string16     /* out - user_input field */)
 
 // Requests that the given URL be opened in the specified manner.
 IPC_MESSAGE_ROUTED4(ViewHostMsg_OpenURL,
                     GURL /* url */,
                     content::Referrer /* referrer */,
                     WindowOpenDisposition /* disposition */,
                     int64 /* frame id */)
 
+// Lets the browser instruct the renderer to ignore a specific navigation
+// request.
+IPC_SYNC_MESSAGE_ROUTED5_1(ViewHostMsg_ShouldIgnoreNavigation,
+                           GURL /* in - url */,
+                           content::Referrer /* in - referrer */,
+                           WindowOpenDisposition /* in - disposition */,
+                           int64 /* in - frame id */,
+                           bool /* in - is_content_initiated */,
+                           bool /* out - result */)
+
 // Notifies that the preferred size of the content changed.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_DidContentsPreferredSizeChange,
                     gfx::Size /* pref_size */)
 
 // Notifies that the scrollbars-visible state of the content changed.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame,
                     bool /* has_horizontal_scrollbar */,
                     bool /* has_vertical_scrollbar */)
 
 // Notifies that the pinned-to-side state of the content changed.
@@ skipping 363 matching lines @@
 // have a javascript send a native value (string, number, boolean) to the
 // listener in Cpp. (DomAutomationController)
 IPC_MESSAGE_ROUTED2(ViewHostMsg_DomOperationResponse,
                     std::string  /* json_string */,
                     int  /* automation_id */)
 
 // Enable or disable inverting of web content pixels, for users who prefer
 // white-on-black.
 IPC_MESSAGE_ROUTED1(ViewMsg_InvertWebContent,
                     bool /* invert */)