Remove code to defer app window appearance until first paint.

extensions/common/api/app_window.idl

 // 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.
 
 // Use the <code>chrome.app.window</code> API to create windows. Windows
 // have an optional frame with title bar and size controls. They are not
 // associated with any Chrome browser windows. See the <a
 // href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/samples/window-state">
 // Window State Sample</a> for a demonstration of these options.
 namespace app.window {
@@ skipping 367 matching lines @@
     // TODO(stevenjb): Investigate implementing this on Windows and OSX.
     [nodoc] static void setIcon(DOMString iconUrl);
 
     // Is the window always on top?
     static boolean isAlwaysOnTop();
 
     // Accessors for testing.
     [nodoc] boolean hasFrameColor;
     [nodoc] long activeFrameColor;
     [nodoc] long inactiveFrameColor;
-    [nodoc] boolean? firstShowHasHappened;
 
     // Set whether the window should stay above most other windows. Requires the
     // <code>alwaysOnTopWindows</code> permission.
     static void setAlwaysOnTop(boolean alwaysOnTop);
 
     // Can the window use alpha transparency?
     // TODO(jackhou): Document this properly before going to stable.
     [nodoc] static boolean alphaEnabled();
 
     // Set whether the window is visible on all workspaces. (Only for platforms
@@ skipping 82 matching lines @@
     [nocompile] static void onMaximized();
 
     // Fired when the window is minimized.
     [nocompile] static void onMinimized();
 
     // Fired when the window is restored from being minimized or maximized.
     [nocompile] static void onRestored();
 
     // Fired when the window's ability to use alpha transparency changes.
     [nocompile, nodoc] static void onAlphaEnabledChanged();
-
-    // Event for testing. Lets tests wait until a window has been shown.
-    [nocompile, nodoc] static void onWindowFirstShown();
   };
 };