Move EmptyString, kWhitespace and the BOM to base.

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

 // 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/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/mac/foundation_util.h"
 #include "base/metrics/histogram.h"
@@ skipping 255 matching lines @@
     UpdatePopup();
 
   if (notify_text_changed)
     TextChanged();
 }
 
 void OmniboxViewMac::SetForcedQuery() {
   // We need to do this first, else |SetSelectedRange()| won't work.
   FocusLocation(true);
 
-  const string16 current_text(GetText());
-  const size_t start = current_text.find_first_not_of(kWhitespaceUTF16);
+  const base::string16 current_text(GetText());
+  const size_t start = current_text.find_first_not_of(base::kWhitespaceUTF16);
   if (start == string16::npos || (current_text[start] != '?')) {
     SetUserText(ASCIIToUTF16("?"));
   } else {
     NSRange range = NSMakeRange(start + 1, current_text.size() - start - 1);
     [[field_ currentEditor] setSelectedRange:range];
   }
 }
 
 bool OmniboxViewMac::IsSelectAll() const {
   if (![field_ currentEditor])
@@ skipping 659 matching lines @@
 
 NSUInteger OmniboxViewMac::GetTextLength() const {
   return [field_ currentEditor] ?  [[[field_ currentEditor] string] length] :
                                    [[field_ stringValue] length];
 }
 
 bool OmniboxViewMac::IsCaretAtEnd() const {
   const NSRange selection = GetSelectedRange();
   return NSMaxRange(selection) == GetTextLength();
 }