[Variations] Bring variations_http_header_provider to variations component

components/variations/variations_http_header_provider.h

 // 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.
 
-#ifndef CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_
-#define CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_
+#ifndef COMPONENTS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_
+#define COMPONENTS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/synchronization/lock.h"
 #include "components/variations/variations_associated_data.h"
 
 namespace content {
 class ResourceContext;
 }
 
 namespace net {
 class HttpRequestHeaders;
 }
 
 class GURL;
-class Profile;
-class ProfileIOData;
 
 template <typename T> struct DefaultSingletonTraits;
 
-namespace chrome_variations {
+namespace variations {
 
 // A helper class for maintaining Chrome experiments and metrics state
 // transmitted in custom HTTP request headers.
 // This class is a thread-safe singleton.
 class VariationsHttpHeaderProvider : base::FieldTrialList::Observer {
  public:
   static VariationsHttpHeaderProvider* GetInstance();
 
   // Adds Chrome experiment and metrics state as custom headers to |headers|.
   // Some headers may not be set given the |incognito| mode or whether
@@ skipping 61 matching lines @@
 
   // Provides the google experiment ids forced from command line.
   std::set<chrome_variations::VariationID> default_variation_ids_set_;
   std::set<chrome_variations::VariationID> default_trigger_id_set_;
 
   std::string variation_ids_header_;
 
   DISALLOW_COPY_AND_ASSIGN(VariationsHttpHeaderProvider);
 };
 
-}  // namespace chrome_variations
+}  // namespace variations
 
-#endif  // CHROME_BROWSER_METRICS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_
+#endif  // COMPONENTS_VARIATIONS_VARIATIONS_HTTP_HEADER_PROVIDER_H_