Revert of Mac: Fix rounded corners on browser windows on retina display.

chrome/browser/ui/cocoa/browser_window_controller_private.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/browser_window_controller_private.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/mac/mac_util.h"
@@ skipping 502 matching lines @@
   // If the relayout shifts the content area up or down, let the renderer know.
   if (contentShifted) {
     if (WebContents* contents =
             browser_->tab_strip_model()->GetActiveWebContents()) {
       if (RenderWidgetHostView* rwhv = contents->GetRenderWidgetHostView())
         rwhv->WindowFrameChanged();
     }
   }
 }
 
-- (void)updateRoundedBottomCorners {
-  [[self tabContentArea] setRoundedBottomCorners:![self isInAnyFullscreenMode]];
-}
-
 - (void)adjustToolbarAndBookmarkBarForCompression:(CGFloat)compression {
   CGFloat newHeight =
       [toolbarController_ desiredHeightForCompression:compression];
   NSRect toolbarFrame = [[toolbarController_ view] frame];
   CGFloat deltaH = newHeight - toolbarFrame.size.height;
 
   if (deltaH == 0)
     return;
 
   toolbarFrame.size.height = newHeight;
@@ skipping 376 matching lines @@
 
   if (notification)  // For System Fullscreen when non-nil.
     [self deregisterForContentViewResizeNotifications];
   enteringAppKitFullscreen_ = NO;
   enteringImmersiveFullscreen_ = NO;
   enteringPresentationMode_ = NO;
 
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
   [[[self window] cr_windowView] setWantsLayer:windowViewWantsLayer_];
-  [self updateRoundedBottomCorners];
 }
 
 - (void)windowWillExitFullScreen:(NSNotification*)notification {
   if (notification)  // For System Fullscreen when non-nil.
     [self registerForContentViewResizeNotifications];
   [self destroyFullscreenExitBubbleIfNecessary];
   [self adjustUIForExitingFullscreenAndStopOmniboxSliding];
 }
 
 - (void)windowDidExitFullScreen:(NSNotification*)notification {
   if (notification)  // For System Fullscreen when non-nil.
     [self deregisterForContentViewResizeNotifications];
   browser_->WindowFullscreenStateChanged();
-  [self updateRoundedBottomCorners];
 }
 
 - (void)windowDidFailToEnterFullScreen:(NSWindow*)window {
   [self deregisterForContentViewResizeNotifications];
   enteringAppKitFullscreen_ = NO;
   [self adjustUIForExitingFullscreenAndStopOmniboxSliding];
 }
 
 - (void)windowDidFailToExitFullScreen:(NSWindow*)window {
   [self deregisterForContentViewResizeNotifications];
@@ skipping 190 matching lines @@
 
 - (void)exitAppKitFullscreen {
   DCHECK(base::mac::IsOSLionOrLater());
   if (FramedBrowserWindow* framedBrowserWindow =
           base::mac::ObjCCast<FramedBrowserWindow>([self window])) {
     [framedBrowserWindow toggleSystemFullScreen];
   }
 }
 
 @end  // @implementation BrowserWindowController(Private)