GitLab

CompositorFrameReportingController::stage_history_ is never used, so
it is removed.

BUG=none
R=behdadb@chromium.org

Change-Id: I27a40a306c7a55d871900ec4fbcc64196ffbc454
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129236
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Reviewed-by: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754932}