Move InitializeICU() to the V8 API and use it.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index c56bc05601e06f20607e0147b0eed429e5e28816..10e69fc2641e30d41580876e4872a996ef720d95 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -45,6 +45,7 @@
 #include "global-handles.h"
 #include "heap-profiler.h"
 #include "heap-snapshot-generator-inl.h"
+#include "icu_util.h"
 #include "messages.h"
 #ifdef COMPRESS_STARTUP_DATA_BZ2
 #include "natives.h"
@@ -5426,6 +5427,11 @@ int v8::V8::ContextDisposedNotification() {
 }
 
 
+bool v8::V8::InitializeICU() {
+  return i::InitializeICU();
+}
+
+
 const char* v8::V8::GetVersion() {
   return i::Version::GetVersion();
 }