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

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/mac/scoped_cftyperef.h"
@@ skipping 159 matching lines @@
 
   ScopedCAActionDisabler disabler;
   [[self layer] setBackgroundColor:cgBackgroundColor];
 }
 
 @end  // @implementation TabContentsContainerView
 
 @implementation TabContentsController
 @synthesize webContents = contents_;
 
-- (id)initWithContents:(WebContents*)contents
-    andAutoEmbedFullscreen:(BOOL)enableEmbeddedFullscreen {
+- (id)initWithContents:(WebContents*)contents {
   if ((self = [super initWithNibName:nil bundle:nil])) {
-    if (enableEmbeddedFullscreen)
-      fullscreenObserver_.reset(new FullscreenObserver(self));
+    fullscreenObserver_.reset(new FullscreenObserver(self));
     [self changeWebContents:contents];
   }
   return self;
 }
 
 - (void)dealloc {
   [static_cast<TabContentsContainerView*>([self view]) delegateDestroyed];
   // Make sure the contents view has been removed from the container view to
   // allow objects to be released.
   [[self view] removeFromSuperview];
@@ skipping 46 matching lines @@
 
   // The rendering path with overlapping views disabled causes bugs when
   // transitioning between composited and non-composited mode.
   // http://crbug.com/279472
   if (!fullscreenView)
     contents_->SetAllowOverlappingViews(true);
 }
 
 - (void)changeWebContents:(WebContents*)newContents {
   contents_ = newContents;
-  if (fullscreenObserver_) {
-    fullscreenObserver_->Observe(contents_);
-    isEmbeddingFullscreenWidget_ =
-        contents_ && contents_->GetFullscreenRenderWidgetHostView();
-  } else {
-    isEmbeddingFullscreenWidget_ = NO;
-  }
+  fullscreenObserver_->Observe(contents_);
+  isEmbeddingFullscreenWidget_ =
+      contents_ && contents_->GetFullscreenRenderWidgetHostView();
 }
 
 // Returns YES if the tab represented by this controller is the front-most.
 - (BOOL)isCurrentTab {
   // We're the current tab if we're in the view hierarchy, otherwise some other
   // tab is.
   return [[self view] superview] ? YES : NO;
 }
 
 - (void)willBecomeUnselectedTab {
@@ skipping 34 matching lines @@
   }
 }
 
 - (void)toggleFullscreenWidget:(BOOL)enterFullscreen {
   isEmbeddingFullscreenWidget_ = enterFullscreen &&
       contents_ && contents_->GetFullscreenRenderWidgetHostView();
   [self ensureContentsVisible];
 }
 
 - (BOOL)contentsInFullscreenCaptureMode {
-  if (!fullscreenObserver_)
-    return NO;
   // Note: Grab a known-valid WebContents pointer from |fullscreenObserver_|.
   content::WebContents* const wc = fullscreenObserver_->web_contents();
   if (!wc ||
       wc->GetCapturerCount() == 0 ||
       wc->GetPreferredSize().IsEmpty() ||
       !(isEmbeddingFullscreenWidget_ ||
         (wc->GetDelegate() &&
          wc->GetDelegate()->IsFullscreenForTabOrPending(wc)))) {
     return NO;
   }
@@ skipping 34 matching lines @@
     } else {
       rect.ClampToCenteredSize(gfx::Size(
           static_cast<int>(x / captureSize.height()), rect.height()));
     }
   }
 
   return NSRectFromCGRect(rect.ToCGRect());
 }
 
 @end