[Variations] Bring variations_http_header_provider to variations component

chrome/browser/search/suggestions/suggestions_service.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 "chrome/browser/search/suggestions/suggestions_service.h"
 
 #include <sstream>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
-#include "chrome/browser/metrics/variations/variations_http_header_provider.h"
 #include "chrome/browser/search/suggestions/blacklist_store.h"
 #include "chrome/browser/search/suggestions/suggestions_store.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/variations/variations_associated_data.h"
+#include "components/variations/variations_http_header_provider.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/escape.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/base/url_util.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/http/http_util.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_status.h"
@@ skipping 210 matching lines @@
   last_request_started_time_ = base::TimeTicks::Now();
 }
 
 net::URLFetcher* SuggestionsService::CreateSuggestionsRequest(const GURL& url) {
   net::URLFetcher* request =
       net::URLFetcher::Create(0, url, net::URLFetcher::GET, this);
   request->SetLoadFlags(net::LOAD_DISABLE_CACHE);
   request->SetRequestContext(url_request_context_);
   // Add Chrome experiment state to the request headers.
   net::HttpRequestHeaders headers;
-  chrome_variations::VariationsHttpHeaderProvider::GetInstance()->AppendHeaders(
+  variations::VariationsHttpHeaderProvider::GetInstance()->AppendHeaders(
       request->GetOriginalURL(), false, false, &headers);
   request->SetExtraRequestHeaders(headers.ToString());
   return request;
 }
 
 void SuggestionsService::OnRequestTimeout() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   ServeFromCache();
 }
 
@@ skipping 120 matching lines @@
   if (last_request_successful) {
     blacklist_delay_sec_ = kBlacklistDefaultDelaySec;
   } else {
     int candidate_delay = blacklist_delay_sec_ * kBlacklistBackoffMultiplier;
     if (candidate_delay < kBlacklistMaxDelaySec)
       blacklist_delay_sec_ = candidate_delay;
   }
 }
 
 }  // namespace suggestions