Convert ReadMessage...() to use the new user pointer handling (see r285350).

mojo/system/core_test_base.cc

 // 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.
 
 #include "mojo/system/core_test_base.h"
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 48 matching lines @@
     if (num_bytes > kMaxMessageNumBytes)
       return MOJO_RESULT_RESOURCE_EXHAUSTED;
 
     if (transports)
       return MOJO_RESULT_UNIMPLEMENTED;
 
     return MOJO_RESULT_OK;
   }
 
   virtual MojoResult ReadMessageImplNoLock(
-      void* bytes,
-      uint32_t* num_bytes,
+      UserPointer<void> bytes,
+      UserPointer<uint32_t> num_bytes,
       DispatcherVector* dispatchers,
       uint32_t* num_dispatchers,
       MojoReadMessageFlags /*flags*/) OVERRIDE {
     info_->IncrementReadMessageCallCount();
     lock().AssertAcquired();
 
-    if (num_bytes && !VerifyUserPointerWithSize<1>(bytes, *num_bytes))
-      return MOJO_RESULT_INVALID_ARGUMENT;
-
     if (num_dispatchers) {
       *num_dispatchers = 1;
       if (dispatchers) {
         // Okay to leave an invalid dispatcher.
         dispatchers->resize(1);
       }
     }
 
     return MOJO_RESULT_OK;
   }
@@ skipping 258 matching lines @@
 }
 
 void CoreTestBase_MockHandleInfo::IncrementCancelAllWaitersCallCount() {
   base::AutoLock locker(lock_);
   cancel_all_waiters_call_count_++;
 }
 
 }  // namespace test
 }  // namespace system
 }  // namespace mojo