Avoid JNI call with pending OOME.

If EnsureResolved fails with an exception then FindClassInPathClassLoader may
fall-through to a call to NewStringUTF with a pending exception.
Bug: 15446488

Change-Id: I007f7bee7c50aa588d0b1c776da67a38314dc897
diff --git a/runtime/class_linker.h b/runtime/class_linker.h
index 006354f..b78d0b5 100644
--- a/runtime/class_linker.h
+++ b/runtime/class_linker.h
@@ -117,8 +117,8 @@
                            Handle<mirror::ClassLoader> class_loader)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  // Find a class in the path class loader, loading it if necessary. Hash function is supposed to
-  // be ComputeModifiedUtf8Hash(descriptor).
+  // Find a class in the path class loader, loading it if necessary without using JNI. Hash
+  // function is supposed to be ComputeModifiedUtf8Hash(descriptor).
   mirror::Class* FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
                                             Thread* self, const char* descriptor, size_t hash,
                                             Handle<mirror::ClassLoader> class_loader)