This reverts commit 8b920b21.

Reason for revert: This had a syntax error and skipped the compile step, so went undetected.

BUG=chromium:778918

Original change's description:
> Export angle::PlatformMethods.
> 
> This should fix undefined function call sanitizer warnings.
> 
> BUG=chromium:778918
> 
> Change-Id: I718d58edd7b75a3fca1089edc4df7f3251d85153
> Reviewed-on: https://chromium-review.googlesource.com/767152
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

TBR=jmadill@chromium.org,piman@chromium.org

Change-Id: I1825ce88bc82867a983bb08cd6732caff54f061c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:778918
Reviewed-on: https://chromium-review.googlesource.com/767128Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>