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Context.getDir() creates Chrome's data directory, app_chrome/, with
rwxrwx--x. ChromeMainDelegateAndroid::RunProcess() then limits this to
rwx------. RunProcess() goes out of its way to avoid granting any user
permissions that weren't already present, but this seems like a mistake;
it shouldn't be possible for app_chrome/ to have fewer permissions than
rwx------. So RunProcess is simplified to set the permissions to exactly
rwx------. Also don't print data_path in the error message because if
PathService::Get() failed, data_path is empty.

Also restrict WebView's directory, app_webview/, using Os.chown(). Doing
this in PathUtils covers both Chrome and WebView. However, Os.chown()
requires API >= 21, which is the case for WebView but not Chrome, so
Chrome's RunProcess() code must stay for now.

Rehabilitate //chrome/test:chrome_app_unittests to run on Android (crbug
609855 says it was broken but it seems to work now) and add a unit test
for the simplified native code.

BUG=832388,609855
internal bug b/19993402

Change-Id: I1bcfe72940ddc1fb23f2b0bef50775853843ea76
Reviewed-on: https://chromium-review.googlesource.com/984773
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551795}