Update ICU38 to r12390 to pick up the security patch.
Update ICU38 to r12390 to pick up the security patch.

BUG=2074,3823
TEST=1. LayoutTests/fast/encoding
     2. chromium/fast/encoding
     3. Go to https://bug381412.bugzilla.mozilla.org/attachment.cgi?id=267398
and see a bunch of 'inverse question marks' for U+FFFD. Also, hovering the mouse
over 'aaa' should not bring up an alert box. A real layout test will be added
later.

TBR=agl

Review URL: http://codereview.chromium.org/45039

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@12427 0039d316-1c4b-4281-b951-d872f2087c98

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