Avoid restoring maximized window down when going fullscreen.

ui/views/win/fullscreen_handler.cc

 // 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.
 
 #include "ui/views/win/fullscreen_handler.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/win_util.h"
 #include "ui/base/win/shell.h"
@@ skipping 28 matching lines @@
   scoped_ptr<ScopedFullscreenVisibility> visibility;
 
   // With Aero enabled disabling the visibility causes the window to disappear
   // for several frames, which looks worse than doing other updates
   // non-atomically.
   if (!ui::win::IsAeroGlassEnabled())
     visibility.reset(new ScopedFullscreenVisibility(hwnd_));
 
   // Save current window state if not already fullscreen.
   if (!fullscreen_) {
-    // Save current window information.  We force the window into restored mode
-    // before going fullscreen because Windows doesn't seem to hide the
-    // taskbar if the window is in the maximized state.
-    saved_window_info_.maximized = !!::IsZoomed(hwnd_);
-    if (saved_window_info_.maximized)
-      ::SendMessage(hwnd_, WM_SYSCOMMAND, SC_RESTORE, 0);
     saved_window_info_.style = GetWindowLong(hwnd_, GWL_STYLE);
     saved_window_info_.ex_style = GetWindowLong(hwnd_, GWL_EXSTYLE);
     GetWindowRect(hwnd_, &saved_window_info_.window_rect);
   }
 
   fullscreen_ = fullscreen;
 
   if (fullscreen_) {
     // Set new window style and size.
     SetWindowLong(hwnd_, GWL_STYLE,
@@ skipping 17 matching lines @@
     // here are ugly, but if SetWindowPos() doesn't redraw, the taskbar won't be
     // repainted.  Better-looking methods welcome.
     SetWindowLong(hwnd_, GWL_STYLE, saved_window_info_.style);
     SetWindowLong(hwnd_, GWL_EXSTYLE, saved_window_info_.ex_style);
 
     // On restore, resize to the previous saved rect size.
     gfx::Rect new_rect(saved_window_info_.window_rect);
     SetWindowPos(hwnd_, NULL, new_rect.x(), new_rect.y(), new_rect.width(),
                  new_rect.height(),
                  SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
-    if (saved_window_info_.maximized)
-      ::SendMessage(hwnd_, WM_SYSCOMMAND, SC_MAXIMIZE, 0);
   }
 }
 
 }  // namespace views