Revert of skstd -> std for unique_ptr

include/core/SkTypes.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTypes_DEFINED
 #define SkTypes_DEFINED
 
@@ skipping 239 matching lines @@
     #define SkToU16(x)  ((uint16_t)(x))
     #define SkToS32(x)  ((int32_t)(x))
     #define SkToU32(x)  ((uint32_t)(x))
     #define SkToInt(x)  ((int)(x))
     #define SkToUInt(x) ((unsigned)(x))
     #define SkToSizeT(x) ((size_t)(x))
 #endif
 
 /** Returns 0 or 1 based on the condition
 */
-#if defined(_MSC_VER)
-    #define SkToBool(cond)  (!!(cond))   // MSVC doesn't like a cast.
-#else
-    #define SkToBool(cond)  static_cast<bool>(cond)
-#endif
+#define SkToBool(cond)  ((cond) != 0)
 
 #define SK_MaxS16   32767
 #define SK_MinS16   -32767
 #define SK_MaxU16   0xFFFF
 #define SK_MinU16   0
 #define SK_MaxS32   0x7FFFFFFF
 #define SK_MinS32   -SK_MaxS32
 #define SK_MaxU32   0xFFFFFFFF
 #define SK_MinU32   0
 #define SK_NaN32    (1 << 31)
@@ skipping 397 matching lines @@
 private:
     void*       fPtr;
     size_t      fSize;  // can be larger than the requested size (see kReuse)
     uint32_t    fStorage[(kSize + 3) >> 2];
 };
 // Can't guard the constructor because it's a template class.
 
 #endif /* C++ */
 
 #endif