Fix "unreachable code" warnings (MSVC warning 4702) in ppapi/.

ppapi/tests/test_file_mapping.cc

 // Copyright 2014 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 "ppapi/tests/test_file_mapping.h"
 
 #include <string.h>
 
 #include <limits>
 #include <string>
@@ skipping 480 matching lines @@
           instance_->pp_instance(),
           file_io2.pp_resource(),
           page_size,
           PP_FILEMAPPROTECTION_WRITE | PP_FILEMAPPROTECTION_READ,
           PP_FILEMAPFLAG_SHARED | PP_FILEMAPFLAG_FIXED,
           0,
           &address_of_middle_page,
           callback.GetCallback().pp_completion_callback()));
   CHECK_CALLBACK_BEHAVIOR(callback);
   ASSERT_EQ(PP_OK, callback.result());
-  PASS();
 
   // Write something else to the mapped region, then unmap, and see if it
   // gets written to both files. (Note we have to Unmap to make sure that the
   // write is committed).
   memset(address, 'c', kNumPages * page_size);
   callback.WaitForResult(
       file_mapping_if_->Unmap(
           instance_->pp_instance(), address, kNumPages * page_size,
           callback.GetCallback().pp_completion_callback()));
   CHECK_CALLBACK_BEHAVIOR(callback);
@@ skipping 19 matching lines @@
                                   0,
                                   &new_file_contents2,
                                   callback_type()));
   ASSERT_EQ(expected_file_contents2, new_file_contents2);
 
   // TODO(dmichael): Test non-zero offset
 
   PASS();
 }