Fixed race condition in O3D/WebGL FileRequest implementation by only initiating download upon send().
Fixed race condition in O3D/WebGL FileRequest implementation by only
initiating download upon send().

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2903002

git-svn-id: http://src.chromium.org/svn/trunk/src@51909 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a51d4b0ac4794993b27f2c6c361d3bc9d17e275c
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser