add dll for Firefox 25.0.1 / Windows

Change-Id: Ibc528c26b383d34aa8a9558061f3726e3659501b
diff --git a/xpcom/prebuilt/extension/lib/WINNT_x86-msvc/ff251/xpGwtDevPlugin.dll b/xpcom/prebuilt/extension/lib/WINNT_x86-msvc/ff251/xpGwtDevPlugin.dll
new file mode 100755
index 0000000..bd25472
--- /dev/null
+++ b/xpcom/prebuilt/extension/lib/WINNT_x86-msvc/ff251/xpGwtDevPlugin.dll
Binary files differ