Update the tests (ISO-8859-1 => windows-1252)

To be compliant to the WHATWG Encoding spec (living standard), we should
treat ISO-8859-1 and windows-1252 synonymously. Moreover, windows-1252
is the canonical encoding name.

Update TextCodecLatin1 to list only aliases specified in the encoding
spec.

See https://codereview.chromium.org/598383002 (ICU update) and
    https://codereview.chromium.org/649413002 (roll ICU with necessary
    test/pref/UI changes in Chrome).

BUG=412053
TEST=fast/encoding/*
TEST=http/tests/misc/char*
R=jochen@chromium.org, jsbell@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183781

Review URL: https://codereview.chromium.org/655083002

git-svn-id: svn://svn.chromium.org/blink/trunk@183912 bbb929c8-8fbe-4397-9dbb-9b2b20218538