size_t -> uint32 for building on win x64

size_t fixes for building on win x64

Fixes C4267 warnings, and errors regarding passing size_t* when they chould be unsigned int *.

winrt_utils:
WindowsCreateString takes a UINT32 as size. Truncation would mean
shorter than expected string, but presumably not a severe problem
in this case.

file_picker:
The interface uses unsigned int, not size_t, so change implementation and callers to unsigned int.


R=cpu@chromium.org
BUG=166496
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=176854

[cpu_(ooo_6.6-7.5), 2013-01-14 22:21:19]

lgtm

https://codereview.chromium.org/11884021/diff/6001/win8/metro_driver/file_pic...
File win8/metro_driver/file_picker.cc (right):

https://codereview.chromium.org/11884021/diff/6001/win8/metro_driver/file_pic...
win8/metro_driver/file_picker.cc:49: return E_INVALIDARG;
return E_UNEXPECTED;

[scottmg, 2013-01-14 22:27:56]

https://codereview.chromium.org/11884021/diff/6001/win8/metro_driver/file_pic...
File win8/metro_driver/file_picker.cc (right):

https://codereview.chromium.org/11884021/diff/6001/win8/metro_driver/file_pic...
win8/metro_driver/file_picker.cc:49: return E_INVALIDARG;
On 2013/01/14 22:21:20, cpu wrote:
> return E_UNEXPECTED;

Done.

[commit-bot: I haz the power, 2013-01-14 22:39:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/scottmg@chromium.org/11884021/10001

[commit-bot: I haz the power, 2013-01-15 08:40:58]

Change committed as 176854