Add font_scale_factor_quirk pref.

chrome/browser/ui/prefs/prefs_tab_helper.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/ui/prefs/prefs_tab_helper.h"
 
 #include <string>
 
 #include "base/prefs/overlay_user_pref_store.h"
 #include "base/prefs/pref_service.h"
@@ skipping 546 matching lines @@
       prefs::kWebKitAllowDisplayingInsecureContent,
       true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kEnableReferrers,
       true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #if defined(OS_ANDROID)
   registry->RegisterDoublePref(
       prefs::kWebKitFontScaleFactor,
-      pref_defaults.font_scale_factor,
+      1.0,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterBooleanPref(
+      prefs::kWebKitFontScaleFactorQuirk,
+      true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kWebKitForceEnableZoom,
       pref_defaults.force_enable_zoom,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kWebKitPasswordEchoEnabled,
       pref_defaults.password_echo_enabled,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
@@ skipping 139 matching lines @@
       WebPreferences web_prefs =
           web_contents_->GetRenderViewHost()->GetWebkitPreferences();
       OverrideFontFamily(&web_prefs, generic_family, script, std::string());
       web_contents_->GetRenderViewHost()->UpdateWebkitPreferences(web_prefs);
       return;
     }
   }
 
   UpdateWebPreferences();
 }