Rename ScopedTaskEnvironment::ExecutionMode

ScopedTaskEnvironment::ExecutionMode is becoming
ScopedTaskEnvironment::ThreadPoolExecutionMode

This CL was uploaded by git cl split.

R=jrummell@chromium.org

Bug: 708584
Change-Id: I56a8c9c5878f9721fcd3dd4870440c2dcfa095f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583889
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654214}
1 file changed