Enable ShortcutsProvider for omnibox on the trunk by default

chrome/browser/autocomplete/shortcuts_provider.cc

 // Copyright (c) 2011 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/autocomplete/shortcuts_provider.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 #include <vector>
@@ skipping 58 matching lines @@
     shortcuts_backend_->RemoveObserver(this);
 }
 
 void ShortcutsProvider::Start(const AutocompleteInput& input,
                               bool minimal_changes) {
   matches_.clear();
 
   if (input.type() == AutocompleteInput::INVALID)
     return;
 
+  if (input.text().empty())
+    return;
+
   if (!initialized_)
     return;
 
   base::TimeTicks start_time = base::TimeTicks::Now();
   GetMatches(input);
   if (input.text().length() < 6) {
     base::TimeTicks end_time = base::TimeTicks::Now();
     std::string name = "ShortcutsProvider.QueryIndexTime." +
         base::IntToString(input.text().size());
     base::Histogram* counter = base::Histogram::FactoryGet(
@@ skipping 211 matching lines @@
 
 void ShortcutsProvider::set_shortcuts_backend(
     history::ShortcutsBackend* shortcuts_backend) {
   DCHECK(shortcuts_backend);
   shortcuts_backend_ = shortcuts_backend;
   shortcuts_backend_->AddObserver(this);
   if (shortcuts_backend_->initialized())
     initialized_ = true;
 }