Fixes bug in instant that resulted in flickery fade. The problem would

chrome/browser/ui/cocoa/browser_window_cocoa.mm

 // Copyright (c) 2010 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/cocoa/browser_window_cocoa.h"
 
 #include "app/l10n_util_mac.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 569 matching lines @@
 }
 
 void BrowserWindowCocoa::PrepareForInstant() {
   // TODO: implement fade as done on windows.
 }
 
 void BrowserWindowCocoa::ShowInstant(TabContents* preview_contents) {
   [controller_ showInstant:preview_contents];
 }
 
-void BrowserWindowCocoa::HideInstant() {
+void BrowserWindowCocoa::HideInstant(bool instant_is_active) {
   [controller_ hideInstant];
+
+  // TODO: add support for |instant_is_active|.
 }
 
 gfx::Rect BrowserWindowCocoa::GetInstantBounds() {
   // Flip coordinates based on the primary screen.
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   NSRect monitorFrame = [screen frame];
   NSRect frame = [controller_ instantFrame];
   gfx::Rect bounds(NSRectToCGRect(frame));
   bounds.set_y(NSHeight(monitorFrame) - bounds.y() - bounds.height());
   return bounds;
@@ skipping 27 matching lines @@
 
 NSWindow* BrowserWindowCocoa::window() const {
   return [controller_ window];
 }
 
 void BrowserWindowCocoa::UpdateSidebarForContents(TabContents* tab_contents) {
   if (tab_contents == browser_->GetSelectedTabContents()) {
     [controller_ updateSidebarForContents:tab_contents];
   }
 }