Content: fix the power save blocker for Win7.

content/browser/power_save_blocker_win.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 <windows.h>
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
@@ skipping 147 matching lines @@
 
   PowerSaveBlockerType type_;
   const std::string reason_;
   base::win::ScopedHandle handle_;
 
   DISALLOW_COPY_AND_ASSIGN(Delegate);
 };
 
 void PowerSaveBlocker::Delegate::ApplyBlock() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  base::win::Version os_version = base::win::GetVersion();
-  if (os_version < base::win::VERSION_WIN7)
+  if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return ApplySimpleBlock(type_, 1);
 
   handle_.Set(CreatePowerRequest(RequestType(), reason_));
 }
 
 void PowerSaveBlocker::Delegate::RemoveBlock() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  base::win::Version os_version = base::win::GetVersion();
-  if (os_version < base::win::VERSION_WIN7)
+  if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return ApplySimpleBlock(type_, -1);
 
   DeletePowerRequest(RequestType(), handle_.Take());
 }
 
 POWER_REQUEST_TYPE PowerSaveBlocker::Delegate::RequestType() {
   if (type_ == kPowerSaveBlockPreventDisplaySleep)
     return PowerRequestDisplayRequired;
 
+  if (base::win::GetVersion() < base::win::VERSION_WIN8)
+    return PowerRequestSystemRequired;
+
   return PowerRequestExecutionRequired;
 }
 
 PowerSaveBlocker::PowerSaveBlocker(PowerSaveBlockerType type,
                                    const std::string& reason)
     : delegate_(new Delegate(type, reason)) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&Delegate::ApplyBlock, delegate_));
 }
 
 PowerSaveBlocker::~PowerSaveBlocker() {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&Delegate::RemoveBlock, delegate_));
 }
 
 }  // namespace content