[gjs/mozjs78: 7/21] Remove some forward declarations. - Forward declaring 'mozilla::DefaultHasher' causes signature conf

[Evan Welsh <ewlsh src gnome org>]

commit 75d0f8133e0037d0a7e173e72e1fb21f9b83ce0f
Author: Evan Welsh <noreply evanwelsh com>
Date:   Sat Jul 4 22:11:07 2020 -0500

    Remove some forward declarations.
    - Forward declaring 'mozilla::DefaultHasher' causes signature conflicts.

 gi/boxed.h            | 4 ----
 gjs/context-private.h | 4 ----
 2 files changed, 8 deletions(-)
---
diff --git a/gi/boxed.h b/gi/boxed.h
index e69ffe2a..483d98e7 100644
--- a/gi/boxed.h
+++ b/gi/boxed.h
@@ -50,10 +50,6 @@ class CallArgs;
 namespace js {
 class SystemAllocPolicy;
 }
-namespace mozilla {
-template <class Key>
-struct DefaultHasher;
-}
 
 /* To conserve memory, we have two different kinds of private data for GBoxed
  * JS wrappers: BoxedInstance, and BoxedPrototype. Both inherit from BoxedBase
diff --git a/gjs/context-private.h b/gjs/context-private.h
index 1b1e5562..fff054a4 100644
--- a/gjs/context-private.h
+++ b/gjs/context-private.h
@@ -50,10 +50,6 @@
 #include "gjs/macros.h"
 #include "gjs/profiler.h"
 
-namespace mozilla {
-template <class Key>
-struct DefaultHasher;
-}
 class GjsAtoms;
 
 using JobQueueStorage =