Split out the raw system access functions (HANDLE) from the handy "wrapper" functions.  Turn the wrapper functionality into an object class that includes ScopedHANDLEs with destructors, etc.

Consider RAII (Resource Acquisition Is Initialization).

Ref: https://codereview.chromium.org/2507263002/

In case the above gets deleted, I'm noting the below in this ticket:

ScopedHANDLE.h:
  48 // ScopedHANDLE wraps a generic Windows HANDLE (with an invalid value of
  49 // nullptr), allowing it to be closed automatically (via NtClose) when the
  50 // object goes out of scope. Use is_valid() function to check validity of
  51 // internal HANDLE. This class may not be used with HANDLEs that have an invalid
  52 // value of INVALID_HANDLE_VALUE (e.g. CreateFile()).
  53 class ScopedHANDLE {
  54  public:
  55   ScopedHANDLE();
  56   explicit ScopedHANDLE(HANDLE handle);
  57   ScopedHANDLE(ScopedHANDLE&& rvalue) : handle_(rvalue.release()) {}
  58   ScopedHANDLE(const ScopedHANDLE&) = delete;
  59   void operator=(const ScopedHANDLE&) = delete;
  60   ~ScopedHANDLE();
  61 
  62   HANDLE get() { return handle_; }
  63   bool is_valid() const;
  64 
  65  private:
  66   // Transfers ownership. If the returned is non-null, it needs to be closed by
  67   // the caller.
  68   HANDLE release();
  69 
  70   HANDLE handle_;
  71 };

ScopedHANDLE.cc:
  568 ScopedHANDLE::ScopedHANDLE() : handle_(nullptr) {}
  569 
  570 ScopedHANDLE::ScopedHANDLE(HANDLE handle) : handle_(handle) {}
  571 
  572 ScopedHANDLE::~ScopedHANDLE() {
  573   if (!g_initialized)
  574     InitNativeRegApi();
  575   if (is_valid())
  576     g_nt_close(handle_);
  577 }
  578 
  579 bool ScopedHANDLE::is_valid() const {
  580   // This class should only be used for HANDLEs that have an invalid value of
  581   // nullptr.
  582   assert(handle_ != INVALID_HANDLE_VALUE);
  583 
  584   return handle_ != nullptr;
  585 }
  586 
  587 HANDLE ScopedHANDLE::release() {
  588   HANDLE result = handle_;
  589   handle_ = nullptr;
  590   return result;
  591 }