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/openjdkjvmti/ti_class.cc b/runtime/openjdkjvmti/ti_class.cc
index c3a1acf..e0af6e8 100644
--- a/runtime/openjdkjvmti/ti_class.cc
+++ b/runtime/openjdkjvmti/ti_class.cc
@@ -69,6 +69,7 @@
 #include "ti_phase.h"
 #include "ti_redefine.h"
 #include "utils.h"
+#include "well_known_classes.h"
 
 namespace openjdkjvmti {