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Instead use the helper method we already have to just convert a raw
string to a serialized string value encoded byte array on the browser
side. This gets rid of some special casing and possible confusion in
this codepath.

Does requre moving string_message_codec to some non-android specific
location (even though this code is only really used on android), and for
that blink/common seemed like a sensible place.

Bug: none
Change-Id: I4ebc70cb68a1c12ad57d3949a1ac606392f7c908
Reviewed-on: https://chromium-review.googlesource.com/1053169Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557363}