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 505 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 isFullscreen]];
+}
+
 - (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 369 matching lines @@
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableSimplifiedFullscreen) &&
       fullscreenUrl_.is_empty()) {
     fullscreenModeController_.reset([[FullscreenModeController alloc]
         initWithBrowserWindowController:self]);
   }
 
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
   [[[self window] cr_windowView] setWantsLayer:NO];
+  [self updateRoundedBottomCorners];
 }
 
 - (void)windowWillExitFullScreen:(NSNotification*)notification {
   if (notification)  // For System Fullscreen when non-nil.
     [self registerForContentViewResizeNotifications];
   fullscreenModeController_.reset();
   [self destroyFullscreenExitBubbleIfNecessary];
   [self setPresentationModeInternal:NO forceDropdown:NO];
 }
 
 - (void)windowDidExitFullScreen:(NSNotification*)notification {
   if (notification)  // For System Fullscreen when non-nil.
     [self deregisterForContentViewResizeNotifications];
   browser_->WindowFullscreenStateChanged();
+  [self updateRoundedBottomCorners];
 }
 
 - (void)windowDidFailToEnterFullScreen:(NSWindow*)window {
   [self deregisterForContentViewResizeNotifications];
   enteringFullscreen_ = NO;
   [self setPresentationModeInternal:NO forceDropdown:NO];
 
   // Force a relayout to try and get the window back into a reasonable state.
   [self layoutSubviews];
 }
@@ skipping 135 matching lines @@
     devTools->SetAllowOverlappingViews(allowOverlappingViews);
 }
 
 - (void)updateInfoBarTipVisibility {
   // If there's no toolbar then hide the infobar tip.
   [infoBarContainerController_
       setShouldSuppressTopInfoBarTip:![self hasToolbar]];
 }
 
 @end  // @implementation BrowserWindowController(Private)