Pure pedantry: Replace all ".size() == 0" with ".empty()".

chrome/browser/speech/speech_input_bubble_controller.cc

 // Copyright (c) 2010 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/speech/speech_input_bubble_controller.h"
 
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_source.h"
 #include "chrome/common/notification_type.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "ui/gfx/rect.h"
 
 namespace speech_input {
 
 SpeechInputBubbleController::SpeechInputBubbleController(Delegate* delegate)
     : delegate_(delegate),
       current_bubble_caller_id_(0),
       registrar_(new NotificationRegistrar) {
 }
 
 SpeechInputBubbleController::~SpeechInputBubbleController() {
-  DCHECK(bubbles_.size() == 0);
+  DCHECK(bubbles_.empty());
 }
 
 void SpeechInputBubbleController::CreateBubble(int caller_id,
                                                int render_process_id,
                                                int render_view_id,
                                                const gfx::Rect& element_rect) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         NewRunnableMethod(this, &SpeechInputBubbleController::CreateBubble,
@@ skipping 180 matching lines @@
 void SpeechInputBubbleController::InvokeDelegateButtonClicked(
     int caller_id, SpeechInputBubble::Button button) {
   delegate_->InfoBubbleButtonClicked(caller_id, button);
 }
 
 void SpeechInputBubbleController::InvokeDelegateFocusChanged(int caller_id) {
   delegate_->InfoBubbleFocusChanged(caller_id);
 }
 
 }  // namespace speech_input