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This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.

Pull in gtest 744.

    Make single argument constructors explicit in macros.

    Remove NOMINMAX macro.

    Add macros for disabling Microsoft Visual C++ warnings.

    Add WhenDynamicCastTo<T> matcher.
    A matcher that matches a pointer that matches inner_matcher when
    dynamic_cast<T> is applied.

    Add IWYU export pragmas to the tuple include lines.

    Fix NativeArray to not require a copy constructor unless we ask for one.
    This allows ElementsAre() to support non-copyable types.

    Examine WINAPI_FAMILY_PARTITION macros to better distinguish windows platforms.
    Author: martin@martin.st
    From: https://codereview.appspot.com/57220043/

changes that haven't made it to svn. The descriptions of each change are listed
below.

- Fixes some python shebang lines.

- Add ElementsAreArray overloads to gmock. ElementsAreArray now makes a copy of
  its input elements before the conversion to a Matcher. ElementsAreArray can
  now take a vector as input. ElementsAreArray can now take an iterator pair as
  input.

- Templatize MatchAndExplain to allow independent string types for the matcher
  and matchee. I also templatized the ConstCharPointer version of
  MatchAndExplain to avoid calls with "char*" from using the new templated
  MatchAndExplain.

- Fixes the bug where the constructor of the return type of ElementsAre() saves
  a reference instead of a copy of the arguments.

- Extends ElementsAre() to accept arrays whose sizes aren't known.

- Switches gTest's internal FilePath class from testing::internal::String to
  std::string. testing::internal::String was introduced when gTest couldn't
  depend on std::string.  It's now deprecated.

- Switches gTest & gMock from using testing::internal::String objects to
  std::string. Some static methods of String are still in use.  We may be able
  to remove some but not all of them.  In particular, String::Format() should
  eventually be removed as it truncates the result at 4096 characters, often
  causing problems.

Renames internal enums to the kFoo naming style.

Fixes gmock doctor to work with newer versions of Clang.

Publishes GTEST_HAS_STREAM_REDIRECTION (by Vlad Losev); casts char to unsigned char before calling isspace() etc to avoid undefined behavior (by Zhanyong Wan); fixes the VC projects (by Fredrik Roubert).

Makes gmock-spec-builders_test.cc and gmock-internal-utils_test.cc work where both ::string  and ::std::string are defined.

Makes all container matchers work with (possibly multi-dimensional) native arrays; makes Contains() accept a matcher; adds Value(x, m); improves gmock doctor to diagnose the Type in Template Base disease.

Made the universal value printer safer when printing char[];
Removed duplicated code in InvokeWith;
Improved gmock_doctor.py.

Finishes SafeMatcherCast by catching lossy arithmetic conversions at compile-time; uses ACTION_TEMPLATE to simplify the definition of many actions; makes mock object uncopyable; teaches gmock doctor about wrong MOCK_METHODn.