Remove object_utils.h.

Break into object_lock, field_helper and method_helper.
Clean up header files following this.
Also tidy some of the Handle code in response to compiler errors when resolving
the changes in this CL.

Change-Id: I73e63015a0f02a754d0866bfaf58208aebcaa295
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index c95be01..4cf4c09 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -25,11 +25,13 @@
 #include "class_linker-inl.h"
 #include "dex_file-inl.h"
 #include "dex_instruction.h"
+#include "field_helper.h"
 #include "gc/accounting/card_table-inl.h"
 #include "gc/space/large_object_space.h"
 #include "gc/space/space-inl.h"
 #include "handle_scope.h"
 #include "jdwp/object_registry.h"
+#include "method_helper.h"
 #include "mirror/art_field-inl.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class.h"
@@ -39,7 +41,6 @@
 #include "mirror/object_array-inl.h"
 #include "mirror/string-inl.h"
 #include "mirror/throwable.h"
-#include "object_utils.h"
 #include "quick/inline_method_analyser.h"
 #include "reflection.h"
 #include "safe_map.h"