Fix leak in Mac PowerSaveBlocker.

content/browser/power_save_blocker_mac.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 "content/browser/power_save_blocker.h"
 
 #include <IOKit/pwr_mgt/IOPMLib.h>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
+#include "base/mac/scoped_cftyperef.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace {
 
 // Power management cannot be done on the UI thread. IOPMAssertionCreate does a
 // synchronous MIG call to configd, so if it is called on the main thread the UI
 // is at the mercy of another process. See http://crbug.com/79559 and
@@ skipping 46 matching lines @@
       level = kIOPMAssertionTypeNoIdleSleep;
       break;
     case PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep:
       level = kIOPMAssertionTypeNoDisplaySleep;
       break;
     default:
       NOTREACHED();
       break;
   }
   if (level) {
-    IOReturn result = IOPMAssertionCreateWithName(level, kIOPMAssertionLevelOn,
-        base::SysUTF8ToCFStringRef(reason_), &assertion_);
+    base::mac::ScopedCFTypeRef<CFStringRef> cf_reason(
+        base::SysUTF8ToCFStringRef(reason_));
+    IOReturn result = IOPMAssertionCreateWithName(level,
+                                                  kIOPMAssertionLevelOn,
+                                                  cf_reason,
+                                                  &assertion_);
     LOG_IF(ERROR, result != kIOReturnSuccess)
         << "IOPMAssertionCreate: " << result;
   }
 }
 
 void PowerSaveBlocker::Delegate::RemoveBlock() {
   DCHECK_EQ(base::PlatformThread::CurrentId(),
             g_power_thread.Pointer()->thread_id());
 
   if (assertion_ != kIOPMNullAssertionID) {
@@ skipping 11 matching lines @@
       base::Bind(&Delegate::ApplyBlock, delegate_));
 }
 
 PowerSaveBlocker::~PowerSaveBlocker() {
   g_power_thread.Pointer()->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&Delegate::RemoveBlock, delegate_));
 }
 
 }  // namespace content