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CLAs look good, thanks!

My bad that I used commit
11/21/2014 03:18:53 SHA-1: 99aa0f9 "Down-integrate from internal code base." as a reference.

This issue:

#define __thread __declspec(thread)

was already fixed by this definition @ common.h:317

#if defined(_MSC_VER)
#define GOOGLE_THREAD_LOCAL __declspec(thread)
#else
#define GOOGLE_THREAD_LOCAL __thread
#endif

in commit by you
on 12/05/2014 SHA-1: d778778 "Fix thread local annotatoin and add back type traits is_convertable for MSVC", although it still does not valid for iOS build, because iOS does not support __thread attribute.

Another issue:

    #ifdef _MSC_VER
        using std::tr1::integral_constant;
        using std::tr1::is_convertible;
        using std::tr1::is_enum;
    #else
    ...

was fixed by you, too
on 12/05/2014 SHA-1: be20ae0 "Fix compile issues and test failures in VS2008."

The last issue (VS2008 error example below):

    error C2512: 'wl::protobuf::`anonymous-namespace'::valkeyOneofInstance' : no appropriate default constructor available

was fixed, but I still wondering why this was happening.
The one element in struct $name$OneofInstance that was needed a constructor is the one with type ::google::protobuf::internal::ArenaStringPtr and it compiles well if we remove const before the member with this type. Here is the screenshots: compiler error place and struct declaration.

So, my pull request became really short. Please excuse me for the inconvenience and not updating to the latest alpha release before commenting (too much work with lots of third-party libraries requires to think twice before updating to the latest release, that's why I had fixed issues with commit I checked out in November instead of keep tracking the development. Sorry.)

P.S. I'm using VS2008 (cl.exe version 15.00.30729.01) and VS2013.