Fix the bug that A11y tray is enabled by default

chrome/browser/chromeos/preferences.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/chromeos/preferences.h"
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/i18n/time_formatting.h"
 #include "base/metrics/histogram.h"
@@ skipping 99 matching lines @@
                               PrefService::UNSYNCABLE_PREF);
   }
   if (prefs->FindPreference(prefs::kMagnifierType) == NULL) {
     prefs->RegisterStringPref(prefs::kMagnifierType,
                               "",
                               PrefService::SYNCABLE_PREF);
   }
   if (prefs->FindPreference(prefs::kShouldAlwaysShowAccessibilityMenu) ==
       NULL) {
     prefs->RegisterBooleanPref(prefs::kShouldAlwaysShowAccessibilityMenu,
-                              "",
-                              PrefService::UNSYNCABLE_PREF);
+                               false,
+                               PrefService::UNSYNCABLE_PREF);
   }
   if (prefs->FindPreference(prefs::kVirtualKeyboardEnabled) == NULL) {
     prefs->RegisterBooleanPref(prefs::kVirtualKeyboardEnabled,
                                false,
                                PrefService::UNSYNCABLE_PREF);
   }
   prefs->RegisterIntegerPref(prefs::kMouseSensitivity,
                              3,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kTouchpadSensitivity,
@@ skipping 644 matching lines @@
 
   input_method::AutoRepeatRate rate;
   rate.initial_delay_in_ms = xkb_auto_repeat_delay_pref_.GetValue();
   rate.repeat_interval_in_ms = xkb_auto_repeat_interval_pref_.GetValue();
   DCHECK(rate.initial_delay_in_ms > 0);
   DCHECK(rate.repeat_interval_in_ms > 0);
   input_method::XKeyboard::SetAutoRepeatRate(rate);
 }
 
 }  // namespace chromeos