Fix official builder compile error when building aura on windows

Fix official builder compile error when building aura on windows

The error is in the chrome_frame_common project
chrome_frame_automation.cc (833) : error C2440: '=' cannot convert from HWND to gfx::NativeWindow

That is because in aura the gfx::NativeWindow is a aura::Window* instead of HWND

BUG=171018
TEST=see bug
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=178037

[cpu_(ooo_6.6-7.5), 2013-01-19 03:01:35]

Trying to fix the official build of aura/ash see bug. I really not sure what I
am doing is right. 

Frankly this is a bit painful so if you guys have stamina to fix this go ahead.
Anyhow this is my take.

[cpu_(ooo_6.6-7.5), 2013-01-20 21:51:23]

+jam for owners check

[robertshield, 2013-01-21 16:46:59]

LGTM, this will at least build. Any type that can be typedef'ed into something
other than a native window handle isn't right for the CreateExternalTab IPC
message. 

I've been punting on making CF + Aura really work, it shouldn't be too hard in
theory. In any case this is fine for now IMO.

[jam, 2013-01-22 07:07:21]

lgtm

On 2013/01/21 16:46:59, robertshield wrote:
> LGTM, this will at least build. Any type that can be typedef'ed into something
> other than a native window handle isn't right for the CreateExternalTab IPC
> message. 
> 
> I've been punting on making CF + Aura really work, it shouldn't be too hard in
> theory. In any case this is fine for now IMO.

it'd be great if this can be looked at sooner rather than later; i.e. it will
either block aura windows going to all users, or CF will break if it's pushed
out. neither of these situations are desirable.