SkRecord: infer return type for visit() and mutate().

src/core/SkBigPicture.cpp

Index: src/core/SkBigPicture.cpp
diff --git a/src/core/SkBigPicture.cpp b/src/core/SkBigPicture.cpp
index 61f3a0ef1c34a686964492b8beb70199f4ef7e04..70f68db337d0c2a7db931da6ec57d7b5d9e946aa 100644
--- a/src/core/SkBigPicture.cpp
+++ b/src/core/SkBigPicture.cpp
@@ -88,9 +88,9 @@ SkBigPicture::Analysis::Analysis(const SkRecord& record) {
 
     bool hasText = false, hasBitmap = false;
     for (int i = 0; i < record.count(); i++) {
-        hasText   = hasText   || record.visit<bool>(i,   text);
-        hasBitmap = hasBitmap || record.visit<bool>(i, bitmap);
-        record.visit<void>(i, path);
+        hasText   = hasText   || record.visit(i,   text);
+        hasBitmap = hasBitmap || record.visit(i, bitmap);
+        record.visit(i, path);
     }
 
     fHasText                    = hasText;