Don't set the STATE_SYSTEM_HOTTRACKED state in tests.

content/browser/accessibility/browser_accessibility_state_impl.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 "content/browser/accessibility/browser_accessibility_state_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "content/browser/accessibility/accessibility_mode_helper.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
@@ skipping 13 matching lines @@
 }
 
 // static
 BrowserAccessibilityStateImpl* BrowserAccessibilityStateImpl::GetInstance() {
   return Singleton<BrowserAccessibilityStateImpl,
                    LeakySingletonTraits<BrowserAccessibilityStateImpl> >::get();
 }
 
 BrowserAccessibilityStateImpl::BrowserAccessibilityStateImpl()
     : BrowserAccessibilityState(),
-      accessibility_mode_(AccessibilityModeOff) {
+      accessibility_mode_(AccessibilityModeOff),
+      disable_hot_tracking_(false) {
   ResetAccessibilityModeValue();
 #if defined(OS_WIN)
   // On Windows, UpdateHistograms calls some system functions with unknown
   // runtime, so call it on the file thread to ensure there's no jank.
   // Everything in that method must be safe to call on another thread.
   BrowserThread::ID update_histogram_thread = BrowserThread::FILE;
 #else
   // On all other platforms, UpdateHistograms should be called on the main
   // thread.
   BrowserThread::ID update_histogram_thread = BrowserThread::UI;
@@ skipping 111 matching lines @@
       WebContentsImpl::GetAllWebContents();
   for (size_t i = 0; i < web_contents_vector.size(); ++i) {
     if (add)
       web_contents_vector[i]->AddAccessibilityMode(mode);
     else
       web_contents_vector[i]->RemoveAccessibilityMode(mode);
   }
 }
 
 }  // namespace content