Revert of Allow BlobDataHandles to be copied, and have their UUIDs read, on any thread. (https://codereview.chromium.org/259773006/)

Reason for revert:
Causes leaks:
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/2069

Original issue's description:
> Allow BlobDataHandles to be copied, and have their UUIDs read, on any thread.
> 
> BUG=108012
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266817

TBR=michaeln@chromium.org,ericu@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=108012

Review URL: https://codereview.chromium.org/252163002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266837 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed