Force enable HTML Imports and Shadow DOM V0 for WebUIResourceBrowserTest.

This patch is a preparation for Shadow DOM V0, Custom Element V0 (CEv0) and HTML Imports removal.
Intent to Deprecate and Remove: http://bit.ly/2RGHe3x
Though we soon make these APIs only available for test by turning the json5 feature flag
from status: "stable" to status: "test" (crrev.com/c/1399776), there is browser tests/chrome internal components that
use them.

This patch enables the V0 APIs for WebUIResourceBrowserTestV0.I18nProcessTest using them.
We should migrate the test.

crrev.com/c/1399776.

Bug: 911943
TEST: ./browser_tests.exe --gtest_filter=WebUIResourceBrowserTestV0.I18nProcessTest on the patch
Change-Id: I6a276a6f07175c8b46299bac02316dae97912d4e
Reviewed-on: https://chromium-review.googlesource.com/c/1404771
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623162}
1 file changed