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|TryEncoding()| invokes |base::UTF16ToCodepage()|,
|net::EscapeQueryParamValue()|, and |net::EscapePath()|. All 3 create
strings of 3 times the length of the input. This is suspected to be
causing about 50 crashes per month.

Invocations to |TryEncoding()| that have resulted in crashes have
originated from different sources; e.g. omnibox & autocomplete,
extensions, and on startup.

This CL truncates the input string to 1,000,000 chars.

Bug: 1137686
Change-Id: I16e997666c07611d24472bcbee99893138e9c5e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559284
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831913}