Roll ICU DEPS.

This pulls in a fix that is needed to roll NaCl.

BUG=none

Review URL: https://codereview.chromium.org/414283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285772 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -126,7 +126,7 @@ deps = {
     "/external/w3c/csswg-test.git@bacbb4a8dca702cd86646761fde96793db13d4f1",
 
   "src/third_party/icu":
-    "/trunk/deps/third_party/icu52@277999",
+    "/trunk/deps/third_party/icu52@285387",
 
   "src/third_party/libexif/sources":
     "/trunk/deps/third_party/libexif/sources@265008",