Have SearchProvider look up the omnibox start margin directly.

chrome/browser/ui/gtk/location_bar_view_gtk.cc

 // Copyright 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/gtk/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 74 matching lines @@
 #include "ui/base/dragdrop/gtk_dnd_util.h"
 #include "ui/base/gtk/gtk_hig_constants.h"
 #include "ui/base/gtk/gtk_signal_registrar.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/canvas_skia_paint.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/gtk_util.h"
 #include "ui/gfx/image/image.h"
-#include "ui/gfx/rect.h"
 
 using content::NavigationEntry;
 using content::OpenURLParams;
 using content::WebContents;
 using extensions::LocationBarController;
 using extensions::Extension;
 
 namespace {
 
 // We are positioned with a little bit of extra space that we don't use now.
@@ skipping 505 matching lines @@
   ui::SetSourceTargetListFromCodeMask(site_type_event_box_,
                                       ui::TEXT_PLAIN |
                                       ui::TEXT_URI_LIST |
                                       ui::CHROME_NAMED_URL);
 }
 
 WebContents* LocationBarViewGtk::GetWebContents() const {
   return browser_->tab_strip_model()->GetActiveWebContents();
 }
 
-gfx::Rect LocationBarViewGtk::GetOmniboxBounds() const {
-  GtkAllocation hbox_allocation;
-  gtk_widget_get_allocation(hbox_.get(), &hbox_allocation);
-  return AllocationToRect(hbox_allocation);
-}
-
 void LocationBarViewGtk::SetPreviewEnabledPageAction(
     ExtensionAction* page_action,
     bool preview_enabled) {
   DCHECK(page_action);
   for (ScopedVector<PageActionViewGtk>::iterator iter =
        page_action_views_.begin(); iter != page_action_views_.end();
        ++iter) {
     if ((*iter)->page_action() == page_action) {
       (*iter)->set_preview_enabled(preview_enabled);
       UpdatePageActions();
@@ skipping 1486 matching lines @@
 }
 
 void LocationBarViewGtk::PageActionViewGtk::InspectPopup(
     ExtensionAction* action) {
   ExtensionPopupGtk::Show(
       action->GetPopupUrl(current_tab_id_),
       owner_->browser_,
       event_box_.get(),
       ExtensionPopupGtk::SHOW_AND_INSPECT);
 }