Remove duplication, split tests

The code move to libdexfile/dex/descriptors_names.cc apparently did not
remove the original code from runtime/utils.cc.  Fix that duplication
and all the header mentions needed.  Also, split the test files to go
along with the new locations for the code to be tested.

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host-gtest
      flash & boot marlin

Change-Id: Ie734672c4bca2c647d8016291f910b5608674545
diff --git a/profman/profile_assistant_test.cc b/profman/profile_assistant_test.cc
index 1dd1a4a..6359814 100644
--- a/profman/profile_assistant_test.cc
+++ b/profman/profile_assistant_test.cc
@@ -20,6 +20,7 @@
 #include "art_method-inl.h"
 #include "base/unix_file/fd_file.h"
 #include "common_runtime_test.h"
+#include "dex/descriptors_names.h"
 #include "exec_utils.h"
 #include "jit/profile_compilation_info.h"
 #include "linear_alloc.h"