Fix (hopefully) the linux64 build issue exposed by Neb's CL.

webkit/tools/pepper_test_plugin/event_handler.cc

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 37 matching lines @@
   MakeNPVariant(cstr, &variant);
   // Report the string to the div.
   NPVariant result;
   browser->invokeDefault(npp_, text_box_, &variant, 1, &result);
   // Release the variant.
   browser->releasevariantvalue(&variant);
   browser->releasevariantvalue(&result);
 }
 
 std::string EventHandler::EventName(double timestamp, int32 type) {
+#if !defined(OS_LINUX)
   std::stringstream strstr;
   strstr.setf(std::ios::fixed, std::ios::floatfield);
   strstr << timestamp << ": ";
   std::string str(strstr.str());
+#else
+  std::string str;
+#endif
   switch (type) {
     case NPEventType_MouseDown:
       return str + "MouseDown";
     case NPEventType_MouseUp:
       return str + "MouseUp";
     case NPEventType_MouseMove:
       return str + "MouseMove";
     case NPEventType_MouseEnter:
       return str + "MouseEnter";
     case NPEventType_MouseLeave:
@@ skipping 99 matching lines @@
     return;
   }
   size_t len;
   char* name = string_duplicate(cstr, &len);
   if (NULL == name) {
     STRINGN_TO_NPVARIANT(NULL, 0, *var);
     return;
   }
   STRINGN_TO_NPVARIANT(name, len, *var);
 }