chrome: Use base::MessageLoop. (Part 3)

chrome/browser/metrics/variations/variations_http_header_provider.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 "chrome/browser/metrics/variations/variations_http_header_provider.h"
 
 #include "base/base64.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/google/google_util.h"
@@ skipping 72 matching lines @@
   UpdateVariationIDsHeaderValue();
 }
 
 void VariationsHttpHeaderProvider::InitVariationIDsCacheIfNeeded() {
   base::AutoLock scoped_lock(lock_);
   if (variation_ids_cache_initialized_)
     return;
 
   // Register for additional cache updates. This is done first to avoid a race
   // that could cause registered FieldTrials to be missed.
-  DCHECK(MessageLoop::current());
+  DCHECK(base::MessageLoop::current());
   base::FieldTrialList::AddObserver(this);
 
   base::TimeTicks before_time = base::TimeTicks::Now();
 
   base::FieldTrial::ActiveGroups initial_groups;
   base::FieldTrialList::GetActiveFieldTrialGroups(&initial_groups);
   for (base::FieldTrial::ActiveGroups::const_iterator it =
            initial_groups.begin();
        it != initial_groups.end(); ++it) {
     const VariationID id =
@@ skipping 47 matching lines @@
     // if IDs are added as the header is recreated. The receiving servers are OK
     // with such descrepancies.
     variation_ids_header_ = hashed;
   } else {
     NOTREACHED() << "Failed to base64 encode Variation IDs value: "
                  << serialized;
   }
 }
 
 }  // namespace chrome_variations