Enable ParseHTMLOnMainThread on TOT

chrome/browser/chrome_content_browser_client.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/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 1493 matching lines @@
       "HtmlPreloadScanning",
 
       // Keys: lowPriorityIframes
       "LowPriorityIFrames",
 
       // Keys: disallowFetchForDocWrittenScriptsInMainFrame
       //       disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections
       //       disallowFetchForDocWrittenScriptsInMainFrameIfEffectively2G
       "DisallowFetchForDocWrittenScriptsInMainFrame",
 
-      // Keys: parseHTMLOnMainThreadSyncTokenize
-      //       parseHTMLOnMainThreadCoalesceChunks
-      "ParseHTMLOnMainThread",
-
       // Keys: cssExternalScannerNoPreload
       //       cssExternalScannerPreload
       "CSSExternalScanner",
   };
 
   std::vector<std::string> blink_settings;
   for (const char* field_trial_name : kBlinkSettingsFieldTrials) {
     // Each blink-settings field trial should include a forcing_flag group,
     // to make sure that clients that specify the blink-settings flag on the
     // command line are excluded from the experiment groups. To make
@@ skipping 1890 matching lines @@
 bool ChromeContentBrowserClient::ShouldRedirectDOMStorageTaskRunner() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectDOMStorageTaskRunner") == "true";
 }
 
 bool ChromeContentBrowserClient::
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }