Remove page IDs from three WebContentsObserver APIs that don't need it.

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 1617 matching lines @@
                      GURL /* top_origin_url */,
                      content::ThreeDAPIType /* context_type */,
                      int /* arb_robustness_status_code */)
 
 // 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 */,
+IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateFaviconURL,
                     std::vector<content::FaviconURL> /* candidates */)
 
 // Sent once a paint happens after the first non empty layout. In other words
 // after the page has painted something.
-IPC_MESSAGE_ROUTED1(ViewHostMsg_DidFirstVisuallyNonEmptyPaint,
-                    int /* page_id */)
+IPC_MESSAGE_ROUTED0(ViewHostMsg_DidFirstVisuallyNonEmptyPaint)
 
 // Sent by the renderer to the browser to start a vibration with the given
 // duration.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_Vibrate,
                      int64 /* milliseconds */)
 
 // Sent by the renderer to the browser to cancel the currently running
 // vibration, if there is one.
 IPC_MESSAGE_CONTROL0(ViewHostMsg_CancelVibration)
 
@@ skipping 123 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.