Don't check autohide taskbar for WS_EX_TOPMOST when we are querying the autohide state.

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index 0eaa84fbd2904eea782b259422301f431b202ae4..a03b2bcc4b83bfcd1587e375674c7a0dab334d34 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -63,6 +63,10 @@ const int WM_NCUAHDRAWFRAME = 0xAF;
 // WM_WINDOWPOSCHANGED won't be received.
 const int WM_WINDOWSIZINGFINISHED = WM_USER;
 
+// Message used by the shell to send us notification messages related to the
+// taskbar.
+const int WM_APPBAR_NOTIFICATION_MESSAGE = WM_APP + 1;
+
 // IsMsgHandled() and BEGIN_SAFE_MSG_MAP_EX are a modified version of
 // BEGIN_MSG_MAP_EX. The main difference is it uses a WeakPtrFactory member
 // (|weak_factory|) that is used in _ProcessWindowMessage() and changing
@@ -424,6 +428,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
     CR_MSG_WM_THEMECHANGED(OnThemeChanged)
     CR_MSG_WM_WINDOWPOSCHANGED(OnWindowPosChanged)
     CR_MSG_WM_WINDOWPOSCHANGING(OnWindowPosChanging)
+    CR_MESSAGE_HANDLER_EX(WM_APPBAR_NOTIFICATION_MESSAGE, OnAppBarMessage)
   CR_END_MSG_MAP()
 
   // Message Handlers.
@@ -482,6 +487,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
   void OnWindowPosChanging(WINDOWPOS* window_pos);
   void OnWindowPosChanged(WINDOWPOS* window_pos);
   LRESULT OnWindowSizingFinished(UINT message, WPARAM w_param, LPARAM l_param);
+  LRESULT OnAppBarMessage(UINT message, WPARAM w_param, LPARAM l_param);
 
   // Receives Windows Session Change notifications.
   void OnSessionChange(WPARAM status_code);