Switch ObserverList::size() to ObserverList::might_have_observers() Pt.1

chrome/browser/download/download_path_reservation_tracker_unittest.cc

 // 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 "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list.h"
@@ skipping 17 matching lines @@
 namespace {
 
 // MockDownloadItem with real observers and state.
 class FakeDownloadItem : public MockDownloadItem {
  public:
   explicit FakeDownloadItem()
       : state_(IN_PROGRESS) {
   }
   virtual ~FakeDownloadItem() {
     FOR_EACH_OBSERVER(Observer, observers_, OnDownloadDestroyed(this));
-    EXPECT_EQ(0u, observers_.size());
+    EXPECT_FALSE(observers_.might_have_observers());
   }
   virtual void AddObserver(Observer* observer) OVERRIDE {
     observers_.AddObserver(observer);
   }
   virtual void RemoveObserver(Observer* observer) OVERRIDE {
     observers_.RemoveObserver(observer);
   }
   virtual void UpdateObservers() OVERRIDE {
     FOR_EACH_OBSERVER(Observer, observers_, OnDownloadUpdated(this));
   }
@@ skipping 642 matching lines @@
       create_directory,
       conflict_action,
       &reserved_path,
       &verified);
   // We cannot truncate a path with very long extension.
   EXPECT_FALSE(verified);
   item->SetState(DownloadItem::COMPLETE);
 }
 
 #endif