Roll ICU to icu52

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of "src").
 #
@@ skipping 108 matching lines @@
 
   "src/third_party/WebKit/LayoutTests/w3c/web-platform-tests":
     Var("chromium_git") +
     "/external/w3c/web-platform-tests.git@6bed4516fe8522d65512c76ef02e4f0ae8234395",
 
   "src/third_party/WebKit/LayoutTests/w3c/csswg-test":
     Var("chromium_git") +
     "/external/w3c/csswg-test.git@bacbb4a8dca702cd86646761fde96793db13d4f1",
 
   "src/third_party/icu":
-    "/trunk/deps/third_party/icu46@262949",
+    "/trunk/deps/third_party/icu52@277999",
 
   "src/third_party/libexif/sources":
     "/trunk/deps/third_party/libexif/sources@265008",
 
   "src/third_party/hunspell":
     "/trunk/deps/third_party/hunspell@278973",
 
   "src/third_party/hunspell_dictionaries":
     "/trunk/deps/third_party/hunspell_dictionaries@255132",
 
@@ skipping 677 matching lines @@
                 "src/third_party/apache-win32",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]