Remove 2-stage RenderWidget initialization

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index ebff4ae5264615c5c72d5ed13a54ff7fc6b236b1..5f29ed2e28a7a3c537c156e1edb409128b21e8dc 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -583,11 +583,6 @@ IPC_MESSAGE_ROUTED2(ViewMsg_SetHistoryOffsetAndLength,
 IPC_MESSAGE_CONTROL1(ViewMsg_New,
                      ViewMsg_New_Params)
 
-// Reply in response to ViewHostMsg_ShowView or ViewHostMsg_ShowWidget.
-// similar to the new command, but used when the renderer created a view
-// first, and we need to update it.
-IPC_MESSAGE_ROUTED0(ViewMsg_CreatingNew_ACK)
-
 // Sends updated preferences to the renderer.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetRendererPrefs,
                     content::RendererPreferences)
@@ -965,9 +960,8 @@ IPC_MESSAGE_ROUTED1(ViewMsg_BeginFrame,
 IPC_MESSAGE_ROUTED1(ViewHostMsg_SetNeedsBeginFrames,
                     bool /* enabled */)
 
-// Sent by the renderer when it is creating a new window.  The browser creates
-// a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
-// MSG_ROUTING_NONE, the view couldn't be created.
+// Sent by the renderer when it is creating a new window.  The browser creates a
+// tab for it.  If route_id is MSG_ROUTING_NONE, the view couldn't be created.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_CreateWindow,
                             ViewHostMsg_CreateWindow_Params,
                             int /* route_id */,
@@ -1019,10 +1013,6 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_ShowWidget,
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowFullscreenWidget,
                     int /* route_id */)
 
-// Indicates the renderer is ready in response to a ViewMsg_New or
-// a ViewMsg_CreatingNew_ACK.
-IPC_MESSAGE_ROUTED0(ViewHostMsg_RenderViewReady)
-
 // Sent by the renderer process to request that the browser close the view.
 // This corresponds to the window.close() API, and the browser may ignore
 // this message.  Otherwise, the browser will generates a ViewMsg_Close