Small cleanup: move all library private key code to Library class

runtime/vm/scanner.cc

Index: runtime/vm/scanner.cc
===================================================================
--- runtime/vm/scanner.cc	(revision 32509)
+++ runtime/vm/scanner.cc	(working copy)
@@ -312,7 +312,7 @@
   current_token_.kind = Token::kIDENT;
   String& literal =
       String::ZoneHandle(Symbols::New(source_, ident_pos, ident_length));
-  if (ident_char0 == kPrivateIdentifierStart) {
+  if (ident_char0 == Library::kPrivateIdentifierStart) {
     // Private identifiers are mangled on a per library basis.
     literal = String::Concat(literal, private_key_);
     literal = Symbols::New(literal);
@@ -932,20 +932,6 @@
 }
 
 
-RawString* Scanner::AllocatePrivateKey(const Library& library) {
-  const String& url = String::Handle(library.url());
-  intptr_t key_value = url.Hash();
-  while (Library::IsKeyUsed(key_value)) {
-    key_value++;
-  }
-  char private_key[32];
-  OS::SNPrint(private_key, sizeof(private_key),
-              "%c%#" Px "", kPrivateKeySeparator, key_value);
-  const String& result = String::Handle(String::New(private_key, Heap::kOld));
-  return result.raw();
-}
-
-
 void Scanner::InitOnce() {
   ASSERT(Isolate::Current() == Dart::vm_isolate());
   for (int i = 0; i < Token::numKeywords; i++) {