Use new --clear_browser_cache on the dart2js bots
Use new --clear_browser_cache on the dart2js bots

We are deprecating --clear_safari_cache in favor of a more general flag the individual browser implementations can use.

R=whesse@google.com

Review URL: https://codereview.chromium.org//257803014

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@35483 260f80e4-7a28-3924-810f-c04153c831b5

dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk