Create a new RenderFrameHost per child frame when --site-per-process is enabled.

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/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 2231 matching lines @@
                             bool /* blocked */)
 
 // Sent by the renderer process to indicate that a context was lost by
 // client 3D content (Pepper 3D, WebGL) running on the page at the
 // given URL.
 IPC_MESSAGE_CONTROL3(ViewHostMsg_DidLose3DContext,
                      GURL /* top_origin_url */,
                      content::ThreeDAPIType /* context_type */,
                      int /* arb_robustness_status_code */)
 
-// This message is sent when a frame is added to the DOM.
-IPC_MESSAGE_ROUTED3(ViewHostMsg_FrameAttached,
-                    int64 /* parent_frame_id*/,
-                    int64 /* frame_id */,
-                    std::string /* frame_name */)
-
-// Notifies the browser that the frame with the given id was detached. The
-// |parent_frame_id| is -1 for the top level frame, otherwise the id of the
-// immediate parent of the detached frame.
-IPC_MESSAGE_ROUTED2(ViewHostMsg_FrameDetached,
-                    int64 /* parent_frame_id */,
-                    int64 /* frame_id */)
-
 // Notifies the browser that document has parsed the body. This is used by the
 // ResourceScheduler as an indication that bandwidth contention won't block
 // first paint.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_WillInsertBody)
 
 // Notification that the urls for the favicon of a site has been determined.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_UpdateFaviconURL,
                     int32 /* page_id */,
                     std::vector<content::FaviconURL> /* candidates */)
 
@@ skipping 103 matching lines @@
 // synchronously (see crbug.com/120597). This IPC message sends the character
 // bounds after every composition change to always have correct bound info.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.