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Update gradle wrapper and build-tools version for flutter create. (#8914)

* Update gradle wrapper and build-tools version.

Tested manually by "flutter create" with Idea "flutter run" and from android studio "run" android app.

* Update com.android.tools.build to 2.3.0
A
asaarnak committed
deb71cc6dcf45297ab4fb6e6ccf3d14fb05be9ab
Parent: d443d59
Committed by Michael Thomsen <mit-mit@users.noreply.github.com> on 3/21/2017, 3:47:32 PM