Removes MessageLoop::TYPE_XXX where possible

chrome/browser/sync_file_system/local/local_file_change_tracker_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/sync_file_system/local/local_file_change_tracker.h"
 
 #include <deque>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
 using fileapi::FileSystemURL;
 using fileapi::FileSystemURLSet;
 using webkit_blob::MockBlobURLRequestContext;
 using webkit_blob::ScopedTextBlob;
 
 namespace sync_file_system {
 
 class LocalFileChangeTrackerTest : public testing::Test {
  public:
   LocalFileChangeTrackerTest()
-      : message_loop_(base::MessageLoop::TYPE_IO),
-        file_system_(GURL("http://example.com"),
+      : file_system_(GURL("http://example.com"),
                      base::MessageLoopProxy::current().get(),
                      base::MessageLoopProxy::current().get()) {}
 
   virtual void SetUp() OVERRIDE {
     file_system_.SetUp();
 
     sync_context_ =
         new LocalFileSyncContext(base::FilePath(),
                                  base::MessageLoopProxy::current().get(),
                                  base::MessageLoopProxy::current().get());
@@ skipping 50 matching lines @@
 
   void RestoreChangesFromTrackerDB() {
     change_tracker()->CollectLastDirtyChanges(file_system_context());
   }
 
   void GetAllChangedURLs(fileapi::FileSystemURLSet* urls) {
     change_tracker()->GetAllChangedURLs(urls);
   }
 
   ScopedEnableSyncFSDirectoryOperation enable_directory_operation_;
-  base::MessageLoop message_loop_;
+  base::MessageLoopForIO message_loop_;
   CannedSyncableFileSystem file_system_;
 
  private:
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileChangeTrackerTest);
 };
 
 TEST_F(LocalFileChangeTrackerTest, GetChanges) {
   EXPECT_EQ(base::PLATFORM_FILE_OK, file_system_.OpenFileSystem());
@@ skipping 552 matching lines @@
 
   // Make sure they're gone from the database too.
   DropChangesInTracker();
   RestoreChangesFromTrackerDB();
 
   GetAllChangedURLs(&urls);
   EXPECT_TRUE(urls.empty());
 }
 
 }  // namespace sync_file_system