Remove search::GetSearchTerms since it always returns empty string

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.h"
 
 #include "base/logging.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "chrome/browser/themes/theme_service.h"
@@ skipping 141 matching lines @@
     // select the entire field.
     // NOTE(shess): This does not interfere with single-clicking to
     // place caret after a selection is made.  An NSTextField only has
     // a selection when it has a field editor.  The field editor is an
     // NSText subview, which will receive the -mouseDown: in that
     // case, and this code will never fire.
     NSText* editor = [self currentEditor];
     if (editor) {
       NSEvent* currentEvent = [NSApp currentEvent];
       if ([currentEvent type] == NSLeftMouseUp &&
-          ![editor selectedRange].length &&
-          (!observer_ || observer_->ShouldSelectAllOnMouseDown())) {
+          ![editor selectedRange].length) {
         [editor selectAll:nil];
       }
     }
 
     return;
   }
 
   // Give the cell a chance to intercept clicks in page-actions and
   // other decorative items.
   if ([cell mouseDown:theEvent inRect:bounds ofView:self]) {
@@ skipping 411 matching lines @@
                                   NSMinY(frame),
                                   suggestWidth,
                                   NSHeight(frame));
 
   gfx::ScopedNSGraphicsContextSaveGState saveGState;
   NSRectClip(suggestRect);
   [cell drawInteriorWithFrame:frame inView:controlView];
 }
 
 }  // namespace autocomplete_text_field