Change WebView package name to be same with system one

Change WebView package name to be same with system one

Package name of system WebView is "com.google.android.webview", while
current self-build one is "com.android.webview". If package name does
not match, it may not work properly if we replace the system one with
self-build one, as package manager uses package name to correctly load
WebView.

BUG=492514

[Yang Gu, 2015-05-27 06:35:04]

yang.gu@intel.com changed reviewers:
+ boliu@chromium.org, mkosiba@chromium.org, mnaganov@chromium.org,
tobiasjs@chromium.org

[Yang Gu, 2015-06-04 04:56:50]

This is not going to change per discussion on bug. Just close it.