Remove include of stdlib.h from SkTypes.h.

src/pathops/SkOpSpan.cpp

Index: src/pathops/SkOpSpan.cpp
diff --git a/src/pathops/SkOpSpan.cpp b/src/pathops/SkOpSpan.cpp
index 5c89c736fb82966b586aa3ee09f759d348b4e91c..df3ef3c9b369aee9e4d02959e057100afde2b761 100755
--- a/src/pathops/SkOpSpan.cpp
+++ b/src/pathops/SkOpSpan.cpp
@@ -369,7 +369,7 @@ void SkOpSpan::setOppSum(int oppSum) {
         this->globalState()->setWindingFailed();
         return;
     }
-    SkASSERT(!DEBUG_LIMIT_WIND_SUM || abs(oppSum) <= DEBUG_LIMIT_WIND_SUM);
+    SkASSERT(!DEBUG_LIMIT_WIND_SUM || SkTAbs(oppSum) <= DEBUG_LIMIT_WIND_SUM);
     fOppSum = oppSum;
 }
 
@@ -379,6 +379,6 @@ void SkOpSpan::setWindSum(int windSum) {
         this->globalState()->setWindingFailed();
         return;
     }
-    SkASSERT(!DEBUG_LIMIT_WIND_SUM || abs(windSum) <= DEBUG_LIMIT_WIND_SUM);
+    SkASSERT(!DEBUG_LIMIT_WIND_SUM || SkTAbs(windSum) <= DEBUG_LIMIT_WIND_SUM);
     fWindSum = windSum;
 }