EDK: Replace HandleTable::GetAndRemoveDispatcher() with GetAndRemoveHandle().

mojo/edk/system/handle.h

Index: mojo/edk/system/handle.h
diff --git a/mojo/edk/system/handle.h b/mojo/edk/system/handle.h
index df7fac2753a03adda9b4a0c212250fdbe92bf58d..c02fa1d974702bfcc750fbffe76c071a33b33f92 100644
--- a/mojo/edk/system/handle.h
+++ b/mojo/edk/system/handle.h
@@ -32,9 +32,20 @@ struct Handle {
   Handle& operator=(const Handle&);
   Handle& operator=(Handle&&);
 
+  // Returns a new |Handle| with the same contents as this object. Useful when a
+  // function takes a |Handle&&| argument and the caller wants to retain its
+  // copy (rather than moving it).
+  Handle Clone() const { return *this; }
+
   // A |Handle| tests as true if it actually has a dispatcher.
   explicit operator bool() const { return !!dispatcher; }
 
+  bool operator==(const Handle& rhs) const {
+    return dispatcher == rhs.dispatcher && rights == rhs.rights;
+  }
+
+  bool operator!=(const Handle& rhs) const { return !operator==(rhs); }
+
   void reset() { *this = Handle(); }
 
   // Note: |dispatcher| is guaranteed to be null if default-constructed or