mac: Tentative fix for Yosemite open file crash.
There's a bug in AppKit that causes Chrome to crash when users attempt to save
or open a file. The code path that causes the crash is only hit by applications
linked against OSX 10.7 SDK (or earlier). This CL registers a default value for
the preference NSViewKeepLayersAround, which prevents this code path from being
hit. The functional implications of changing the preference
NSViewKeepLayersAround are minimal.
BUG=428977
Review URL: https://codereview.chromium.org/
941453002
Cr-Commit-Position: refs/heads/master@{#316968}