Enable blink-side switch for LoadingWithMojo

As we have launched LoadingWithMojo feature, this change enables the
the blink side switch. This does not affect the product behavior because
the chromium side switch has already been enabled and the blink side
switch is turned on by it. This only affects layout tests behavior.

Bug: 603396
Change-Id: Ifaa2e519e7aad51da1c0789c024ddb887e8e1cca
Reviewed-on: https://chromium-review.googlesource.com/805455
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522681}
3 files changed