Rename ScopedTaskEnvironment::ExecutionMode

ScopedTaskEnvironment::ExecutionMode is becoming
ScopedTaskEnvironment::ThreadPoolExecutionMode

This CL was uploaded by git cl split.

R=treib@chromium.org

Bug: 708584
Change-Id: Idfe4b886de9235bd2f935929235453bb30305729
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583756
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654001}
1 file changed