Bug 1522547 - Differentiate GMPServiceParent and GMPServiceChild __CLASS__ macro. r=cpearce

The macros in these classes are used to output class names in logs.
Differentiating them helps make logs clearer.

Differential Revision: https://phabricator.services.mozilla.com/D21979

--HG--
extra : moz-landing-system : lando

dom/media/gmp/GMPServiceChild.cpp

@@ -33,7 +33,7 @@ namespace mozilla {
 #ifdef __CLASS__
 #  undef __CLASS__
 #endif
-#define __CLASS__ "GMPService"
+#define __CLASS__ "GMPServiceChild"
 
 namespace gmp {
 

dom/media/gmp/GMPServiceParent.cpp

@@ -55,7 +55,7 @@ namespace mozilla {
 #ifdef __CLASS__
 #  undef __CLASS__
 #endif
-#define __CLASS__ "GMPService"
+#define __CLASS__ "GMPServiceParent"
 
 #define NS_DispatchToMainThread(...) CompileError_UseAbstractMainThreadInstead