bookmarks: Fix mistakes found by cppcheck.

chrome/browser/bookmarks/bookmark_model_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 <set>
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 769 matching lines @@
       model->AddURL(bb_node, i, child->GetTitle(),
           GURL("http://" + UTF16ToASCII(child->GetTitle())));
     }
   }
 }
 
 // Test class that creates a BookmarkModel with a real history backend.
 class BookmarkModelTestWithProfile : public testing::Test {
  public:
   BookmarkModelTestWithProfile()
-      : ui_thread_(BrowserThread::UI, &message_loop_),
+      : bb_model_(NULL),
+        ui_thread_(BrowserThread::UI, &message_loop_),
         file_thread_(BrowserThread::FILE, &message_loop_) {}
 
   // testing::Test:
   virtual void TearDown() OVERRIDE {
     profile_.reset(NULL);
   }
 
  protected:
   // Verifies the contents of the bookmark bar node match the contents of the
   // TestNode.
@@ skipping 360 matching lines @@
   AssertExtensiveChangesObserverCount(1, 0);
   model_.EndExtensiveChanges();
   EXPECT_TRUE(model_.IsDoingExtensiveChanges());
   AssertExtensiveChangesObserverCount(1, 0);
   model_.EndExtensiveChanges();
   EXPECT_FALSE(model_.IsDoingExtensiveChanges());
   AssertExtensiveChangesObserverCount(1, 1);
 }
 
 }  // namespace