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This CL creates //components/external_intents, initially populating it
with the previously //chrome-level switch that is used to disable the
launching of external intents. The ultimate goal is to have //chrome's
ExternalNavigationHandler.java and friends live inside this component
for sharing with WebLayer.

Bug: 1031465
Change-Id: I738f5a9eff6d415aedc85364cb4b8e6c0bb1475b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082377Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746285}