[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/spellchecker/spellcheck_custom_dictionary_unittest.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 <vector>
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
@@ skipping 35 matching lines @@
     word = *it;
     sync_pb::EntitySpecifics specifics;
     specifics.mutable_dictionary()->set_word(word);
     data.push_back(syncer::SyncData::CreateLocalData(word, word, specifics));
   }
   return data;
 }
 
 }  // namespace
 
-static ProfileKeyedService* BuildSpellcheckService(Profile* profile) {
-  return new SpellcheckService(profile);
+static ProfileKeyedService* BuildSpellcheckService(
+    content::BrowserContext* profile) {
+  return new SpellcheckService(static_cast<Profile*>(profile));
 }
 
 class SpellcheckCustomDictionaryTest : public testing::Test {
  protected:
   SpellcheckCustomDictionaryTest()
       : ui_thread_(BrowserThread::UI, &message_loop_),
         file_thread_(BrowserThread::FILE, &message_loop_),
         profile_(new TestingProfile) {
   }
 
@@ skipping 1050 matching lines @@
   EXPECT_EQ(2u, loaded_custom_words.size());
 
   histogram =
       StatisticsRecorder::FindHistogram("SpellCheck.CustomWords");
   ASSERT_TRUE(histogram != NULL);
   scoped_ptr<HistogramSamples> samples2 = histogram->SnapshotSamples();
 
   samples2->Subtract(*baseline);
   EXPECT_EQ(2,samples2->sum());
 }