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CL https://chromium-review.googlesource.com/c/chromium/src/+/823238/ introduces
processing messages from IFrames. Function CRWWebController:respondToMessage:
userIsInteracting:originURL:isMainFrame: incorrectly processes case when no handler
for message form IFrames. Which leads to using |handler|, when |handler| = nil.
This CL fixes that.

Bug: 801485
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I661754b83e2e09a4a907634d15f50e62a315c343
Reviewed-on: https://chromium-review.googlesource.com/916604
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536741}