Remove unused param "width_" from SearchBox::OnMarginChange().

chrome/common/render_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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 289 matching lines @@
 
 IPC_MESSAGE_ROUTED0(ChromeViewMsg_DetermineIfPageSupportsInstant)
 
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SearchBoxSetDisplayInstantResults,
                     bool /* display_instant_results */)
 
 IPC_MESSAGE_ROUTED2(ChromeViewMsg_SearchBoxFocusChanged,
                     OmniboxFocusState /* new_focus_state */,
                     OmniboxFocusChangeReason /* reason */)
 
-IPC_MESSAGE_ROUTED2(ChromeViewMsg_SearchBoxMarginChange,
-                    int /* start */,
-                    int /* width */)
+IPC_MESSAGE_ROUTED1(ChromeViewMsg_SearchBoxMarginChange, int /* start */)
 
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SearchBoxMostVisitedItemsChanged,
                     std::vector<InstantMostVisitedItem> /* items */)
 
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SearchBoxPromoInformation,
                     bool /* is_app_launcher_enabled */)
 
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SearchBoxSetInputInProgress,
                     bool /* input_in_progress */)
 
@@ skipping 432 matching lines @@
                      std::vector<GURL> /* search_urls */,
                      GURL /* new_tab_page_url */)
 
 // Tells listeners that a detailed message was reported to the console by
 // WebKit.
 IPC_MESSAGE_ROUTED4(ChromeViewHostMsg_DetailedConsoleMessageAdded,
                     base::string16 /* message */,
                     base::string16 /* source */,
                     extensions::StackTrace /* stack trace */,
                     int32 /* severity level */)