update for Firefox 25.0.1 / Mac

Change-Id: I7875166a642d0827b6c534fc587b65b43af5e889
diff --git a/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff251/libgwt_dev_ff251.dylib b/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff251/libgwt_dev_ff251.dylib
new file mode 100755
index 0000000..2c60650
--- /dev/null
+++ b/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff251/libgwt_dev_ff251.dylib
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