Simplify LoadNativeLibrary()

With ApplicationLoaders.getClassLoader() ensuring
linker-namespace initialization there is no longer
need for LoadNativeLibrary() and callers to pass
along namespace-specific information to art.

This change removes unnecessary parameters of such
calls.

Bug: http://b/27189432
Bug: http://b/22548808
Change-Id: I341d35a2d5195e634678b352f4361f8712984b69
(cherry picked from commit c286a7fcd8a446c086127bf03fd07f904e017336)
diff --git a/runtime/well_known_classes.cc b/runtime/well_known_classes.cc
index cfa8329..d288943 100644
--- a/runtime/well_known_classes.cc
+++ b/runtime/well_known_classes.cc
@@ -385,7 +385,7 @@
   ScopedLocalRef<jclass> java_lang_Runtime(env, env->FindClass("java/lang/Runtime"));
   java_lang_Runtime_nativeLoad =
       CacheMethod(env, java_lang_Runtime.get(), true, "nativeLoad",
-                  "(Ljava/lang/String;Ljava/lang/ClassLoader;ZLjava/lang/String;Ljava/lang/String;)"
+                  "(Ljava/lang/String;Ljava/lang/ClassLoader;Ljava/lang/String;)"
                       "Ljava/lang/String;");
 }