Git: Remove unused declarations

Change-Id: I733aa001a721376ad69c0ae492290e37c71b6f84
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cvs/cvsplugin.h

@@ -43,7 +43,6 @@ QT_END_NAMESPACE
 
 namespace Core {
 class CommandLocator;
-class IEditorFactory;
 class IVersionControl;
 }
 

src/plugins/git/gitplugin.h

@@ -47,11 +47,9 @@ QT_END_NAMESPACE
 
 namespace Core {
 class IEditor;
-class IEditorFactory;
 class Command;
 class CommandLocator;
 class Context;
-class ActionManager;
 class ActionContainer;
 }
 namespace Utils { class ParameterAction; }