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

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 d4b3703ef7a9f0a4cc990c977b7cdc888411d8c6..1bb0789068ba4ba0a014f4b752aa3a70c1900295 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -1635,14 +1635,12 @@ IPC_MESSAGE_CONTROL3(ViewHostMsg_DidLose3DContext,
 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.