[chromium] Delete uncalled unreserveContentsTextures function

[chromium] Delete uncalled unreserveContentsTextures function
https://bugs.webkit.org/show_bug.cgi?id=84005

Patch by James Robinson <jamesr@chromium.org> on 2012-04-16
Reviewed by Adrienne Walker.

This is vestigal dead code.

* platform/graphics/chromium/Canvas2DLayerChromium.cpp:
* platform/graphics/chromium/Canvas2DLayerChromium.h:
(Canvas2DLayerChromium):
* platform/graphics/chromium/LayerChromium.h:
* platform/graphics/chromium/cc/CCLayerImpl.h:
(CCLayerImpl):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114284 268f45cc-cd09-0410-ab3c-d52691b4dbfc