Roll ICU and convert include style to standard Chromium style,

DEPS

 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 
 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
@@ skipping 57 matching lines @@
     (Var("googlecode_url") % "trace-viewer") + "/trunk@192",
 
   # Note that this is *not* where we check out WebKit -- this just
   # puts some extra files into place for the real WebKit checkout to
   # happen.  See lines mentioning "webkit_revision" for the real
   # WebKit checkout.
   "src/third_party/WebKit":
     "/trunk/deps/third_party/WebKit@76115",
 
   "src/third_party/icu":
-    "/trunk/deps/third_party/icu46@172827",
+    "/trunk/deps/third_party/icu46@174978",
 
   "src/third_party/libexif/sources":
     "/trunk/deps/third_party/libexif/sources@146817",
 
   "src/third_party/hunspell":
    "/trunk/deps/third_party/hunspell@174476",
 
   "src/third_party/hunspell_dictionaries":
     "/trunk/deps/third_party/hunspell_dictionaries@168258",
 
@@ skipping 502 matching lines @@
   "+googleurl",
   "+ipc",
 
   # Everybody can use headers generated by tools/generate_library_loader.
   "+library_loaders",
 
   # For now, we allow ICU to be included by specifying "unicode/...", although
   # this should probably change.
   "+unicode",
   "+testing",
+  "+third_party/icu/public",
 ]
 
 
 # checkdeps.py shouldn't check include paths for files in these dirs:
 skip_child_includes = [
   "breakpad",
   "chrome_frame",
   "delegate_execute",
   "metro_driver",
   "native_client_sdk",
@@ skipping 52 matching lines @@
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]