Remove include of stdlib.h from SkTypes.h.

tests/Time.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTime.h"
 #include "Test.h"
 
@@ skipping 26 matching lines @@
     REPORTER_ASSERT(r, dateTime.fDay <= 31);
 
     REPORTER_ASSERT(r, dateTime.fHour <= 23);
 
     REPORTER_ASSERT(r, dateTime.fMinute <= 59);
 
     REPORTER_ASSERT(r, dateTime.fSecond <= 60);  // leap seconds are 23:59:60
 
     // The westernmost timezone is -12:00.
     // The easternmost timezone is +14:00.
-    REPORTER_ASSERT(r, abs(SkToInt(dateTime.fTimeZoneMinutes)) <= 14 * 60);
+    REPORTER_ASSERT(r, SkTAbs(SkToInt(dateTime.fTimeZoneMinutes)) <= 14 * 60);
 
     SkString timeStamp;
     dateTime.toISO8601(&timeStamp);
     REPORTER_ASSERT(r, timeStamp.size() > 0);
     if (r->verbose()) {  // `dm --veryVerbose`
         SkDebugf("\nCurrent Time (ISO-8601 format): \"%s\"\n",
                  timeStamp.c_str());
     }
 }