Rename GlobalSynchronization to Locks

Also address some review comments in common_throws relating to
ToStr<InvokeType> and exception detail messages.

Change-Id: Ibf2c0f147689fa236d349bd7f01eed3c2522552b
diff --git a/src/reference_table.h b/src/reference_table.h
index de9d45d..f398eb2 100644
--- a/src/reference_table.h
+++ b/src/reference_table.h
@@ -43,14 +43,14 @@
 
   size_t Size() const;
 
-  void Dump(std::ostream& os) const SHARED_LOCKS_REQUIRED(GlobalSynchronization::mutator_lock_);
+  void Dump(std::ostream& os) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   void VisitRoots(Heap::RootVisitor* visitor, void* arg);
 
  private:
   typedef std::vector<const Object*> Table;
   static void Dump(std::ostream& os, const Table& entries)
-      SHARED_LOCKS_REQUIRED(GlobalSynchronization::mutator_lock_);
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   friend class IndirectReferenceTable; // For Dump.
 
   std::string name_;