Removed obsolete ENABLE_3D_CANVAS=1 build flag.
Removed obsolete ENABLE_3D_CANVAS=1 build flag.

TEST=built and ran WebGL content on Mac OS X
BUG=none
Review URL: http://codereview.chromium.org/6712041

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@78770 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser