Remove uses of base::hash_map from //chrome

chrome/renderer/tts_dispatcher.cc

Index: chrome/renderer/tts_dispatcher.cc
diff --git a/chrome/renderer/tts_dispatcher.cc b/chrome/renderer/tts_dispatcher.cc
index 4a01190a284829bc20b4153a58e6745aa6bc285e..4457253d15b77cf3f16b7f60e9eb9cd151e69b6e 100644
--- a/chrome/renderer/tts_dispatcher.cc
+++ b/chrome/renderer/tts_dispatcher.cc
@@ -86,8 +86,7 @@ void TtsDispatcher::Cancel() {
 }
 
 WebSpeechSynthesisUtterance TtsDispatcher::FindUtterance(int utterance_id) {
-  base::hash_map<int, WebSpeechSynthesisUtterance>::const_iterator iter =
-      utterance_id_map_.find(utterance_id);
+  const auto iter = utterance_id_map_.find(utterance_id);
   if (iter == utterance_id_map_.end())
     return WebSpeechSynthesisUtterance();
   return iter->second;