ART: Clean up art_field.h

Clean up the header. Fix up other headers including the -inl file,
in an effort to prune the include graph. Fix broken transitive
includes by making includes explicit.

Test: m
Change-Id: I6ff2d6f89b741d8188e19426eccf4743fec688fc
diff --git a/runtime/mirror/class-refvisitor-inl.h b/runtime/mirror/class-refvisitor-inl.h
index ffc4af5..3d52ead 100644
--- a/runtime/mirror/class-refvisitor-inl.h
+++ b/runtime/mirror/class-refvisitor-inl.h
@@ -19,6 +19,7 @@
 
 #include "class-inl.h"
 
+#include "art_field-inl.h"
 #include "class_ext-inl.h"
 
 namespace art {