gesture nav: Disable for M28.

chrome/browser/ui/browser.cc

 // Copyright 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/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 1109 matching lines @@
       FROM_HERE, base::Bind(&Browser::CloseFrame, weak_factory_.GetWeakPtr()));
 
   // Instant may have visible WebContents that need to be detached before the
   // window system closes.
   instant_controller_.reset();
 }
 
 bool Browser::CanOverscrollContent() const {
 #if defined(USE_AURA)
   bool overscroll_enabled = CommandLine::ForCurrentProcess()->
-      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
+      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) == "1";
   if (!overscroll_enabled)
     return false;
   if (is_app() || is_devtools() || !is_type_tabbed())
     return false;
 
   // The detached bookmark bar has appearance of floating above the
   // web-contents. This does not play nicely with overscroll navigation
   // gestures. So disable overscroll navigation when the bookmark bar is in the
   // detached state.
   if (bookmark_bar_state_ == BookmarkBar::DETACHED)
@@ skipping 1067 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }