Implementing app command to query EULA acceptance state for Chrome. 

There are 2 parts to this change:
1. Implement setup.exe switch --query-eula-acceptance, and return the result via exit code.
  - Main use case is system-level, which requires the "--system-level" switch.
  - Return code: 0 if "not accepted", 1 if "accepted", and -1 if failed.

2. Add the app command query-eula-acceptance to Chrome binary during installation to execute:
  setup.exe --query-eula-acceptance [--system-level]

BUG=151303
TBR=ben

Review URL: https://chromiumcodereview.appspot.com/12035043

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180052 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed