Portable versions of NativeMessageHandler and NativeCookieHandler#189

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ncruces wants to merge 2 commits intoanaisbetts:masterfrom

ncruces:windows

Commits on Oct 16, 2015

Make it clear Cookies in NativeCookieHandler are not to be changed.
ncruces
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Commits on Oct 17, 2015

Improved portable versions NativeMessageHandler and NativeCookieHandler.
ncruces
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