[Isolates] Fix compile under Win32 and presumably for FreeBSD, OpenBS...

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 5088)
+++ src/api.cc	(working copy)
@@ -3953,13 +3953,13 @@
 }
 
 
-Isolate::Isolate* New() {
+Isolate* Isolate::New() {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
-Isolate::Isolate* GetCurrent() {
+Isolate* Isolate::GetCurrent() {
   UNIMPLEMENTED();
   return NULL;
 }