Remove warning that happens all the time in the course of normal execution.

Since we look in /system/app/Foo.apk.oat before /data/art-cache, we were getting warnings all the time.

Change-Id: Ic2627819861b02bff8c7cee3d8219ccb8be8ec08
diff --git a/src/oat_file.cc b/src/oat_file.cc
index 62fc740..32a8a86 100644
--- a/src/oat_file.cc
+++ b/src/oat_file.cc
@@ -131,7 +131,6 @@
 
   char* absolute_path = realpath(elf_filename.c_str(), NULL);
   if (absolute_path == NULL) {
-    PLOG(WARNING) << "Failed to create absolute path for " << elf_filename;
     return false;
   }
   dlopen_handle_ = dlopen(absolute_path, RTLD_NOW);