Ensure Content-Length does not appear with Transfer-Encoding
Ensure Content-Length does not appear with Transfer-Encoding

In the HTTPTransport test, verify the requirement of RFC 7230 §3.3.2
that Content-Length not appear if Transfer-Encoding is present.

TEST=crashpad_util_test HTTPTransport.*
BUG=crashpad:159

Change-Id: I51eafff9659443e1d9bb67d1213c8cecc757ded6
Reviewed-on: https://chromium-review.googlesource.com/439984
Reviewed-by: Robert Sesek <f55ad94e336f3a28322d0a25d280221ea9daf7a3@chromium.org>

chromium/crashpad,atom/crashpad,atom/crashpad,chromium/crashpad,atom/crashpad,chromium/crashpad