Update ICU to 5.2 (matching chromium)

Makefile

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 455 matching lines @@
 
 gtags.clean:
         rm -f gtags.files GPATH GRTAGS GSYMS GTAGS
 
 # Dependencies. "builddeps" are dependencies required solely for building,
 # "dependencies" includes also dependencies required for development.
 # Remember to keep these in sync with the DEPS file.
 builddeps:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1831
-        svn checkout --force \
-            https://src.chromium.org/chrome/trunk/deps/third_party/icu46 \
-            third_party/icu --revision 258359
+        if svn info third_party/icu |& grep -q icu46 ; then \
+          svn switch --force \
+              https://src.chromium.org/chrome/trunk/deps/third_party/icu52 \
+              third_party/icu --revision 277999 ; \
+        else \
+          svn checkout --force \
+              https://src.chromium.org/chrome/trunk/deps/third_party/icu52 \
+              third_party/icu --revision 277999 ; \
+        fi
 
 dependencies: builddeps
         # The spec is a copy of the hooks in v8's DEPS file.
         gclient sync -r fb782d4369d5ae04f17a2fceef7de5a63e50f07b --spec="solutions = [{u'managed': False, u'name': u'buildtools', u'url': u'https://chromium.googlesource.com/chromium/buildtools.git', u'custom_deps': {}, u'custom_hooks': [{u'name': u'clang_format_win',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=win32',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/win/clang-format.exe.sha1']},{u'name': u'clang_format_mac',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=darwin',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/mac/clang-format.sha1']},{u'name': u'clang_format_linux',u'pattern': u'.',u'action': [u'download_from_google_storage',u'--no_resume',u'--platform=linux*',u'--no_auth',u'--bucket',u'chromium-clang-format',u'-s',u'buildtools/linux64/clang-format.sha1']}],u'deps_file': u'.DEPS.git', u'safesync_url': u''}]"