Fix http/tests/images/drag-image-to-desktop.html

Fix http/tests/images/drag-image-to-desktop.html

PHP 5.4.0 and newer implement hex2bin natively. Since PHP versions
aren't uniform across platforms, just prefix it and hope it doesn't
collide with another function in the future.

BUG=none

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185322

[dcheng, 2014-11-13 20:11:56]

dcheng@chromium.org changed reviewers:
+ japhet@chromium.org

[dcheng, 2014-11-13 20:11:56]

Yay! PHP!

[Nate Chapin, 2014-11-13 20:25:26]

lgtm

[dcheng, 2014-11-13 20:48:15]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2014-11-13 20:49:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/724863003/1

[commit-bot: I haz the power, 2014-11-13 21:23:12]

Committed patchset #1 (id:1) as 185322

[Peter Beverloo, 2014-11-14 11:29:47]

On 2014/11/13 21:23:12, I haz the power (commit-bot) wrote:
> Committed patchset #1 (id:1) as 185322

"@ECHO OFF :BEGIN CLS ECHO Creating directory "c:\booom"... cmd /c mkdir
c:\booom ECHO Ready PAUSE :END"

Is that stuff there on purpose?

[dcheng, 2014-11-14 19:18:18]

On 2014/11/14 at 11:29:47, peter wrote:
> On 2014/11/13 21:23:12, I haz the power (commit-bot) wrote:
> > Committed patchset #1 (id:1) as 185322
> 
> "@ECHO OFF :BEGIN CLS ECHO Creating directory "c:\booom"... cmd /c mkdir
c:\booom ECHO Ready PAUSE :END"
> 
> Is that stuff there on purpose?

Originally, the test referred to generatedimage.bat, and the idea was that we
would save it with the right extension. I guess there were attacks where you
could trick Blink into saving a picture with a .bat file extension. If the user
inadvertently ran the .bat file later, then bad things. I don't know that those
lines are strictly necessary, but it doesn't hurt to have them either, right?