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This CL fixes an issue where target=_blank links in Chrome Apps wouldn't
open when clicked.

This CL adds a target_blank_implies_no_opener WebPreference as enabled
by default and plumbs the disabling from extension_webkit_preferences.cc.

Bug: 1152286
Change-Id: Ib4e86c5df9c2a2f8945178c47bcd6cb4cd62ff9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612624Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841324}