Remove calls to MessageLoop::current() in components.

components/variations/variations_http_header_provider.cc

 // Copyright 2014 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 "components/variations/variations_http_header_provider.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "components/variations/proto/client_variations.pb.h"
 
 namespace variations {
 
 // static
 VariationsHttpHeaderProvider* VariationsHttpHeaderProvider::GetInstance() {
   return base::Singleton<VariationsHttpHeaderProvider>::get();
 }
 
 std::string VariationsHttpHeaderProvider::GetClientDataHeader() {
@@ skipping 103 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(base::MessageLoop::current());
+  DCHECK(base::ThreadTaskRunnerHandle::IsSet());
   base::FieldTrialList::AddObserver(this);
 
   base::TimeTicks before_time = base::TimeTicks::Now();
 
   base::FieldTrial::ActiveGroups initial_groups;
   base::FieldTrialList::GetActiveFieldTrialGroups(&initial_groups);
 
   for (const auto& entry : initial_groups) {
     const VariationID id =
         GetGoogleVariationID(GOOGLE_WEB_PROPERTIES, entry.trial_name,
@@ skipping 70 matching lines @@
 
   std::set<VariationID> all_variation_ids_set = default_variation_ids_set_;
   for (VariationID id : variation_ids_set_)
     all_variation_ids_set.insert(id);
   for (VariationID id : synthetic_variation_ids_set_)
     all_variation_ids_set.insert(id);
   return all_variation_ids_set;
 }
 
 }  // namespace variations