Strip official builds on the chromium.perf builder.
Strip official builds on the chromium.perf builder.

BUG=279262,271252

Review URL: https://chromiumcodereview.appspot.com/22839022

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@220114 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build