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Now that it is no longer in use, This change removes the implementation of
WebCString, and cleans up the few dangling \#includes and comments which still
referenced it.

Bug: 568803
Change-Id: I19717da309c7ee885542e1c688a6383a12fe9081
Reviewed-on: https://chromium-review.googlesource.com/594673Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491238}