Make mojo_system static and mojo_system_impl a component, never use both

mojo/system/simple_dispatcher.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_SIMPLE_DISPATCHER_H_
 #define MOJO_SYSTEM_SIMPLE_DISPATCHER_H_
 
 #include <list>
 
 #include "base/basictypes.h"
 #include "mojo/system/dispatcher.h"
 #include "mojo/system/system_impl_export.h"
 #include "mojo/system/waiter_list.h"
 
 namespace mojo {
 namespace system {
 
 // A base class for simple dispatchers. "Simple" means that there's a one-to-one
 // correspondence between handles and dispatchers (see the explanatory comment
-// in core_impl.cc). This class implements the standard waiter-signalling
-// mechanism in that case.
+// in core.cc). This class implements the standard waiter-signalling mechanism
+// in that case.
 class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher {
  protected:
   SimpleDispatcher();
   virtual ~SimpleDispatcher();
 
   // To be called by subclasses when the state changes (so
   // |SatisfiedFlagsNoLock()| and |SatisfiableFlagsNoLock()| should be checked
   // again). Must be called under lock.
   void StateChangedNoLock();
 
@@ skipping 16 matching lines @@
   // Protected by |lock()|:
   WaiterList waiter_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_SIMPLE_DISPATCHER_H_