Don't set the STATE_SYSTEM_HOTTRACKED state in tests.

content/browser/accessibility/dump_accessibility_browsertest_base.cc

 // Copyright 2014 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/dump_accessibility_browsertest_base.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/path_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/accessibility/accessibility_tree_formatter.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
+#include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/accessibility_browser_test_utils.h"
 
 namespace content {
@@ skipping 85 matching lines @@
           line.substr(deny_str.size())),
                                 Filter::DENY));
     } else if (StartsWithASCII(line, wait_str, true)) {
       *wait_for = line.substr(wait_str.size());
     }
   }
 }
 
 void DumpAccessibilityTestBase::RunTest(
     const base::FilePath file_path, const char* file_dir) {
+  // Disable the "hot tracked" state (set when the mouse is hovering over
+  // an object) because it makes test output change based on the mouse position.
+  BrowserAccessibilityStateImpl::GetInstance()->
+      set_disable_hot_tracking_for_testing(true);
+
   NavigateToURL(shell(), GURL(url::kAboutBlankURL));
 
   // Output the test path to help anyone who encounters a failure and needs
   // to know where to look.
   printf("Testing: %s\n", file_path.MaybeAsASCII().c_str());
 
   std::string html_contents;
   base::ReadFileToString(file_path, &html_contents);
 
   // Read the expected file.
@@ skipping 97 matching lines @@
     EXPECT_TRUE(base::WriteFile(
         actual_file, actual_contents.c_str(), actual_contents.size()));
 
     ADD_FAILURE() << "No expectation found. Create it by doing:\n"
                   << "mv " << actual_file.LossyDisplayName() << " "
                   << expected_file.LossyDisplayName();
   }
 }
 
 }  // namespace content