Bug 579614: Fix struct/class mismatch build warning. no-r

content/canvas/public/DocumentRendererNativeIDChild.h

@@ -40,7 +40,7 @@
 #include "mozilla/ipc/PDocumentRendererNativeIDChild.h"
 
 class nsIDOMWindow;
-class gfxMatrix;
+struct gfxMatrix;
 
 namespace mozilla {
 namespace ipc {

content/canvas/public/DocumentRendererShmemChild.h

@@ -40,7 +40,7 @@
 #include "mozilla/ipc/PDocumentRendererShmemChild.h"
 
 class nsIDOMWindow;
-class gfxMatrix;
+struct gfxMatrix;
 
 namespace mozilla {
 namespace ipc {

dom/ipc/TabChild.h

@@ -72,7 +72,7 @@
 #include "nsWeakReference.h"
 #include "nsITabChild.h"
 
-class gfxMatrix;
+struct gfxMatrix;
 
 namespace mozilla {
 namespace dom {

dom/ipc/TabParent.h

@@ -55,7 +55,7 @@
 
 class nsIURI;
 class nsIDOMElement;
-class gfxMatrix;
+struct gfxMatrix;
 
 struct JSContext;
 struct JSObject;