Clear SDCH information on "Clear browsing data" path.

chrome/browser/net/sdch_dictionary_fetcher.cc

Index: chrome/browser/net/sdch_dictionary_fetcher.cc
diff --git a/chrome/browser/net/sdch_dictionary_fetcher.cc b/chrome/browser/net/sdch_dictionary_fetcher.cc
index 1130fe336242b5b5c666a2ae433771e1b98d3bd4..396515ef9da87409d6fe1978d261918669978e93 100644
--- a/chrome/browser/net/sdch_dictionary_fetcher.cc
+++ b/chrome/browser/net/sdch_dictionary_fetcher.cc
@@ -49,6 +49,16 @@ void SdchDictionaryFetcher::Schedule(const GURL& dictionary_url) {
   ScheduleDelayedRun();
 }
 
+void SdchDictionaryFetcher::Cancel() {
+  DCHECK(CalledOnValidThread());
+
+  std::queue<GURL> trash_queue;
+  fetch_queue_.swap(trash_queue);
+  attempted_load_.clear();
+  weak_factory_.InvalidateWeakPtrs();
+  current_fetch_.reset(NULL);
+}
+
 void SdchDictionaryFetcher::ScheduleDelayedRun() {
   if (fetch_queue_.empty() || current_fetch_.get() || task_is_pending_)
     return;