Ignore objc-property-no-attribute warning for classdump generated file.

Ignores a warning caused by iPhoneSimulatorRemoteClient.h classdump generated
file.

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/61743015

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@239513 4ff67af0-8c30-449e-8e8b-ad334ec8d88c