Fix SkTFits in to work properly with signed/unsigned mixtures.

include/core/SkTemplates.h

Index: include/core/SkTemplates.h
===================================================================
--- include/core/SkTemplates.h	(revision 9972)
+++ include/core/SkTemplates.h	(working copy)
@@ -64,13 +64,6 @@
     );
 }
 
-/** Returns true if the source value 's' will fit in the destination type 'D'. */
-template <typename D, typename S> inline bool SkTFitsIn(S s) {
-    // the cast to <S> is just to restore the signedness of S, to avoid
-    // sign-unsigned comparison warnings.
-    return static_cast<S>(static_cast<D>(s)) == s;
-}
-
 /** \class SkAutoTCallVProc
 
     Call a function when this goes out of scope. The template uses two