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Currently, the NavigationImmediateResponse feature is enabled by
default through a flag kNavigationImmediateResponseBody.

As this feature has been landed for some time, this patch removes this
flag and the support for the old behavior.

Bug: 1017705
Change-Id: If02d58b28ccaadfa1ca94e080217321521a009fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911148
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716024}