Bug 958643, part 6 - Remove some unused forward decls. r=krizsa

MozReview-Commit-ID: yMpU0hDUXP

--HG--
extra : rebase_source : 154cab1e7673490c824525e46a36ebd359872021

js/xpconnect/loader/mozJSComponentLoader.h

@@ -23,8 +23,6 @@
 #include "xpcpublic.h"
 
 class nsIFile;
-class nsIPrincipal;
-class nsIXPConnectJSObjectHolder;
 class ComponentLoaderInfo;
 
 namespace mozilla {

storage/mozStorageStatement.h

@@ -19,7 +19,6 @@
 #include "StorageBaseStatementInternal.h"
 #include "mozilla/Attributes.h"
 
-class nsIXPConnectJSObjectHolder;
 struct sqlite3_stmt;
 
 namespace mozilla {