Have SearchProvider look up the omnibox start margin directly.

chrome/browser/ui/views/location_bar/location_bar_view.cc

 // 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.
 
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/command_line.h"
@@ skipping 1060 matching lines @@
 }
 
 InstantController* LocationBarView::GetInstant() {
   return delegate_->GetInstant();
 }
 
 WebContents* LocationBarView::GetWebContents() const {
   return delegate_->GetWebContents();
 }
 
-gfx::Rect LocationBarView::GetOmniboxBounds() const {
-  return bounds();
-}
-
 int LocationBarView::GetHorizontalEdgeThickness() const {
   // In maximized popup mode, there isn't any edge.
   return (is_popup_mode_ && browser_ && browser_->window() &&
       browser_->window()->IsMaximized()) ? 0 : vertical_edge_thickness();
 }
 
 void LocationBarView::RefreshContentSettingViews() {
   for (ContentSettingViews::const_iterator i(content_setting_views_.begin());
        i != content_setting_views_.end(); ++i) {
     (*i)->Update(model_->GetInputInProgress() ? NULL : GetWebContents());
@@ skipping 411 matching lines @@
 int LocationBarView::GetInternalHeight(bool use_preferred_size) {
   int total_height =
       use_preferred_size ? GetPreferredSize().height() : height();
   return std::max(total_height - (vertical_edge_thickness() * 2), 0);
 }
 
 bool LocationBarView::HasValidSuggestText() const {
   return suggested_text_view_->visible() &&
       !suggested_text_view_->size().IsEmpty();
 }