Type conversion fixes, content/ edition.

content/test/plugin/plugin_request_read_test.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 "content/test/plugin/plugin_request_read_test.h"
 
 #include "base/basictypes.h"
 
 namespace NPAPIClient {
 
@@ skipping 73 matching lines @@
   }
   // Shrink range to mark area we have just received.
   it->offset += len;
   if (static_cast<int32>(it->length) < len)
     it->length = 0;
   else
     it->length -= len;
   if (it->length == 0)
     requested_ranges_.erase(it);
 
-  // Verify that data, which we got, is right.
+  // Verify the data we got is right.  We expect a string like "01234...".
   const char* data = static_cast<const char*>(buffer);
   for (int32 i = 0; i < len; ++i) {
-    int cur_offset = offset + i;
-    char expected = '0' + cur_offset;
+    char expected = '0' + static_cast<char>(offset + i);
     if (data[i] != expected) {
       SetError("Content mismatch between data and source!");
       break;
     }
   }
   if (requested_ranges_.empty())
     SignalTestCompleted();
 
   return len;
 }
 
 }  // namespace NPAPIClient