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Change In-Product Help UI strings (http://go/cs-iph-strings).
Also fix a bug in IPH that caused a NullPointerExcepetion.

Bug: 784561
Change-Id: Icad33dbacc12d8c4d186b119f90c6262ac0cf976
Reviewed-on: https://chromium-review.googlesource.com/769678
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517537}