Made sync code build and pass unit tests on OS X.

chrome/browser/sync/util/event_sys_unittest.cc

 // Copyright (c) 2009 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 <iosfwd>
 #include <sstream>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 69 matching lines @@
       delete *i;
   }
 
   void Hookup(const string name, Pair::Channel* channel) {
     hookups_.push_back(NewEventListenerHookup(channel, this,
                                               &EventLogger::HandlePairEvent,
                                               name));
   }
 
   void HandlePairEvent(const string& name, const TestEvent& event) {
-    const char* what_changed;
-    int new_value;
+    const char* what_changed = NULL;
+    int new_value = 0;
     Hookups::iterator dead;
     switch (event.what_happened) {
     case TestEvent::A_CHANGED:
       what_changed = "A";
       new_value = event.source->a();
       break;
     case TestEvent::B_CHANGED:
       what_changed = "B";
       new_value = event.source->b();
       break;
@@ skipping 163 matching lines @@
   Pair sally("Sally");
   HookupDeleter deleter;
   deleter.hookup_ = NewEventListenerHookup(sally.event_channel(),
                                            &deleter,
                                            &HookupDeleter::HandleEvent);
   sally.set_a(1);
   ASSERT_TRUE(NULL == deleter.hookup_);
 }
 
 }  // namespace