Removing using namespace std as per Blink coding guidelines

Source/core/loader/CrossOriginPreflightResultCache.cpp

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 #include "core/loader/CrossOriginPreflightResultCache.h"
 
 #include "core/fetch/CrossOriginAccessControl.h"
 #include "platform/network/ResourceResponse.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/MainThread.h"
 #include "wtf/StdLibExtras.h"
 
 namespace WebCore {
 
-using namespace std;
-
 // These values are at the discretion of the user agent.
 static const unsigned defaultPreflightCacheTimeoutSeconds = 5;
 static const unsigned maxPreflightCacheTimeoutSeconds = 600; // Should be short enough to minimize the risk of using a poisoned cache after switching to a secure network.
 
 static bool parseAccessControlMaxAge(const String& string, unsigned& expiryDelta)
 {
     // FIXME: this will not do the correct thing for a number starting with a '+'
     bool ok = false;
     expiryDelta = string.toUIntStrict(&ok);
     return ok;
@@ skipping 100 matching lines @@
 CrossOriginPreflightResultCache& CrossOriginPreflightResultCache::shared()
 {
     DEFINE_STATIC_LOCAL(CrossOriginPreflightResultCache, cache, ());
     ASSERT(isMainThread());
     return cache;
 }
 
 void CrossOriginPreflightResultCache::appendEntry(const String& origin, const KURL& url, PassOwnPtr<CrossOriginPreflightResultCacheItem> preflightResult)
 {
     ASSERT(isMainThread());
-    m_preflightHashMap.set(make_pair(origin, url), preflightResult);
+    m_preflightHashMap.set(std::make_pair(origin, url), preflightResult);
 }
 
 bool CrossOriginPreflightResultCache::canSkipPreflight(const String& origin, const KURL& url, StoredCredentials includeCredentials, const String& method, const HTTPHeaderMap& requestHeaders)
 {
     ASSERT(isMainThread());
-    CrossOriginPreflightResultHashMap::iterator cacheIt = m_preflightHashMap.find(make_pair(origin, url));
+    CrossOriginPreflightResultHashMap::iterator cacheIt = m_preflightHashMap.find(std::make_pair(origin, url));
     if (cacheIt == m_preflightHashMap.end())
         return false;
 
     if (cacheIt->value->allowsRequest(includeCredentials, method, requestHeaders))
         return true;
 
     m_preflightHashMap.remove(cacheIt);
     return false;
 }
 
 void CrossOriginPreflightResultCache::empty()
 {
     ASSERT(isMainThread());
     m_preflightHashMap.clear();
 }
 
 } // namespace WebCore