linux: fix and build test plugins on 64-bit builds

webkit/tools/npapi_layout_test_plugin/PluginObject.cpp

Index: webkit/tools/npapi_layout_test_plugin/PluginObject.cpp
diff --git a/webkit/tools/npapi_layout_test_plugin/PluginObject.cpp b/webkit/tools/npapi_layout_test_plugin/PluginObject.cpp
index 2e671e60417c8b9b8800c0320ff9a38ac38991ee..f06e09981274ec09a99e0419ac9793256d696ee5 100644
--- a/webkit/tools/npapi_layout_test_plugin/PluginObject.cpp
+++ b/webkit/tools/npapi_layout_test_plugin/PluginObject.cpp
@@ -501,14 +501,14 @@ static bool testGetIntIdentifier(PluginObject*, const NPVariant* args, uint32_t
 
     if (NPVARIANT_IS_DOUBLE(args[0])) {
         identifier = browser->getintidentifier((int)NPVARIANT_TO_DOUBLE(args[0]));
-        INT32_TO_NPVARIANT((int32)identifier, *result);
-        return true;
     } else if (NPVARIANT_IS_INT32(args[0])) {
         identifier = browser->getintidentifier((int)NPVARIANT_TO_INT32(args[0]));
-        INT32_TO_NPVARIANT((int32)identifier, *result);
-        return true;
+    } else {
+        return false;
     }
-    return false;
+
+    INT32_TO_NPVARIANT(static_cast<int32>(reinterpret_cast<intptr_t>(identifier)), *result);
+    return true;
 }
 
 static bool testGetProperty(PluginObject* obj, const NPVariant* args, uint32_t argCount, NPVariant* result)