Remove --disable-fullscreen-within-tab command-line flag.

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 1583 matching lines @@
                              const content::FileChooserParams& params) {
   FileSelectHelper::RunFileChooser(web_contents, params);
 }
 
 void Browser::EnumerateDirectory(WebContents* web_contents,
                                  int request_id,
                                  const base::FilePath& path) {
   FileSelectHelper::EnumerateDirectory(web_contents, request_id, path);
 }
 
 bool Browser::EmbedsFullscreenWidget() const {

[Avi (use Gerrit), 2014/07/10 05:30:04]

Is this a useful function if it always returns true? Can we kill it?

[miu, 2014/07/10 06:20:16]

Can't kill it.  It's an override of
WebContentsDelegate::EmbedsFullscreenWidget(), and there are other delegates
that would return false.

[Avi (use Gerrit), 2014/07/10 13:14:22]

No problem.

-  return !CommandLine::ForCurrentProcess()->
-      HasSwitch(switches::kDisableFullscreenWithinTab);
+  return true;
 }
 
 void Browser::ToggleFullscreenModeForTab(WebContents* web_contents,
                                          bool enter_fullscreen) {
   fullscreen_controller_->ToggleFullscreenModeForTab(web_contents,
                                                      enter_fullscreen);
 }
 
 bool Browser::IsFullscreenForTabOrPending(
     const WebContents* web_contents) const {
@@ skipping 805 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;
 }