Revert of Remove linux_use_tcmalloc and switch to use_allocator in Blink. (https://codereview.chromium.org/259543003/)

Reason for revert:
Broke Linux ASAN build: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20ASAN/builds/12782

Original issue's description:
> Remove linux_use_tcmalloc and switch to use_allocator in Blink.
> 
> See https://src.chromium.org/viewvc/blink?revision=168591&view=revision,
> the bug and http://crrev.com/255129 for the details.
> 
> BUG=345554
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=172528

TBR=haraken@chromium.org,jochen@chromium.org,jamesr@chromium.org,dmikurube@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=345554

Review URL: https://codereview.chromium.org/251533005

git-svn-id: svn://svn.chromium.org/blink/trunk@172540 bbb929c8-8fbe-4397-9dbb-9b2b20218538