Make brokenImage() a static member of ImageResource class

brokenImage() is now a static member of ImageResource class

Changed the method signature and the function calls.
No new testcases needed.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156407

[spartha, 2013-08-14 11:10:32]

I am working on a different patch where I needed access to the "brokenimage"
object. In the current code that is not possible without an instance of the
ImageResource. Hence proposing this change.

[Hajime Morrita, 2013-08-15 00:06:45]

lgtm.

[Hajime Morrita, 2013-08-15 00:07:47]

Ouch. Did I close this accidentally or did you? Feel free to open.

[commit-bot: I haz the power, 2013-08-20 05:18:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sudarshan.p@samsung.com/23083003/1

[spartha, 2013-08-20 05:20:14]

On 2013/08/15 00:07:47, morrita1 wrote:
> Ouch. Did I close this accidentally or did you? Feel free to open.

I actually closed the issue, as I thought of using an alternate approach in my
other patch. I guess right now we can have this change. So I am reopening the
issue.

[commit-bot: I haz the power, 2013-08-20 05:32:56]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[commit-bot: I haz the power, 2013-08-20 07:30:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sudarshan.p@samsung.com/23083003/10002

[commit-bot: I haz the power, 2013-08-20 07:40:26]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[commit-bot: I haz the power, 2013-08-20 18:59:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sudarshan.p@samsung.com/23083003/10002

[commit-bot: I haz the power, 2013-08-20 19:44:47]

Change committed as 156407