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

chrome/browser/sync/engine/syncer_thread.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 "chrome/browser/sync/engine/syncer_thread.h"
 
 #include "build/build_config.h"
 
 #ifdef OS_MACOSX
 #include <CoreFoundation/CFNumber.h>
 #include <IOKit/IOTypes.h>
@@ skipping 57 matching lines @@
                                                      CFSTR("HIDIdleTime"),
                                                      kCFAllocatorDefault,
                                                      0);
   if (!object) {
     LOG(WARNING) << "Could not get IOHIDSystem's HIDIdleTime property";
     IOObjectRelease(hid_service);
     return 0;
   }
 
   int64 idle_time;  // in nanoseconds
-  Boolean success;
+  Boolean success = false;
   if (CFGetTypeID(object) == CFNumberGetTypeID()) {
     success = CFNumberGetValue((CFNumberRef)object,
                                kCFNumberSInt64Type,
                                &idle_time);
   } else {
     LOG(WARNING) << "IOHIDSystem's HIDIdleTime property isn't a number!";
   }
 
   CFRelease(object);
   IOObjectRelease(hid_service);
@@ skipping 593 matching lines @@
       break;
   }
 
   if (NULL != vault_.syncer_) {
     vault_.syncer_->set_notifications_enabled(
         p2p_authenticated_ && p2p_subscribed_);
   }
 }
 
 }  // namespace browser_sync