Have SearchProvider look up the omnibox start margin directly.

chrome/browser/ui/gtk/omnibox/omnibox_view_gtk_unittest.cc

 // Copyright 2013 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/omnibox/omnibox_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/platform_test.h"
 #include "ui/base/gtk/gtk_hig_constants.h"
 #include "ui/gfx/image/image.h"
-#include "ui/gfx/rect.h"
 
 namespace {
 class OmniboxEditControllerMock : public OmniboxEditController {
  public:
   MOCK_METHOD4(OnAutocompleteAccept, void(const GURL& url,
                                           WindowOpenDisposition disposition,
                                           content::PageTransition transition,
                                           const GURL& alternate_nav_url));
   MOCK_METHOD0(OnChanged, void());
   MOCK_METHOD0(OnSelectionBoundsChanged, void());
   MOCK_METHOD1(OnInputInProgress, void(bool in_progress));
   MOCK_METHOD0(OnKillFocus, void());
   MOCK_METHOD0(OnSetFocus, void());
   MOCK_CONST_METHOD0(GetFavicon, gfx::Image());
   MOCK_CONST_METHOD0(GetTitle, string16());
   MOCK_METHOD0(GetInstant, InstantController*());
   MOCK_CONST_METHOD0(GetWebContents, content::WebContents*());
-  MOCK_CONST_METHOD0(GetOmniboxBounds, gfx::Rect());
 
   virtual ~OmniboxEditControllerMock() {}
 };
 }  // namespace
 
 class OmniboxViewGtkTest : public PlatformTest {
  public:
   OmniboxViewGtkTest() : file_thread_(content::BrowserThread::UI) {}
 
   virtual void SetUp() {
@@ skipping 42 matching lines @@
   GtkTextIter i;
   const char input[] = "  hello, world ";
   const std::string expected = "hello, world";
   SetPasteClipboardRequested(true);
   view_->OnBeforePossibleChange();
   gtk_text_buffer_get_iter_at_offset(text_buffer_, &i, 0);
   gtk_text_buffer_insert(text_buffer_, &i, input, strlen(input));
 
   ASSERT_EQ(expected, UTF16ToUTF8(view_->GetText()));
 }