Change AndroidHistoryProviderService to use CancelableTaskTracker (3/6)

chrome/browser/history/history_backend_android.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 "chrome/browser/history/history_backend.h"
 
 #include "chrome/browser/history/android/android_provider_backend.h"
 
 namespace history {
 
@@ skipping 68 matching lines @@
   bool result = false;
   if (android_provider_backend_) {
     result = android_provider_backend_->DeleteHistory(selection, selection_args,
                                                       &count);
   }
   request->ForwardResult(request->handle(), result, count);
 }
 
 // Statement -------------------------------------------------------------------
 
-void HistoryBackend::MoveStatement(
-    scoped_refptr<MoveStatementRequest> request,
-    history::AndroidStatement* statement,
-    int current_pos,
-    int destination) {
+int HistoryBackend::MoveStatement(history::AndroidStatement* statement,
+                                  int current_pos,
+                                  int destination) {
   DCHECK_LE(-1, current_pos);
   DCHECK_LE(-1, destination);
 
   int cur = current_pos;
   if (current_pos > destination) {
     statement->statement()->Reset(false);
     cur = -1;
   }
   for (; cur < destination; ++cur) {
     if (!statement->statement()->Step())
       break;
   }
 
-  request->ForwardResult(request->handle(), cur);
+  return cur;
 }
 
 void HistoryBackend::CloseStatement(AndroidStatement* statement) {
   delete statement;
 }
 
 // Search Term -----------------------------------------------------------------
 
 void HistoryBackend::InsertSearchTerm(scoped_refptr<InsertRequest> request,
                                       const SearchRow& row) {
@@ skipping 48 matching lines @@
     const std::string& sort_order) {
   AndroidStatement* statement = NULL;
   if (android_provider_backend_) {
     statement = android_provider_backend_->QuerySearchTerms(projections,
         selection, selection_args, sort_order);
   }
   return statement;
 }
 
 }  // namespace history