Do not pass --runtime-arg -classpath in dex2oat_test

There is no need to pass the current runtime classpath as none of the
tests depend on it.

Bug: 38138251
Test: m test-art-host-gtest

(cherry picked from commit 1ccf61377290451b4e5cfe29ece5de3c8c585e0e)

Change-Id: Iff715cca6a0c5b2c741dfd220297509c4cab0526
diff --git a/dex2oat/dex2oat_test.cc b/dex2oat/dex2oat_test.cc
index 68ec0b5..7744341 100644
--- a/dex2oat/dex2oat_test.cc
+++ b/dex2oat/dex2oat_test.cc
@@ -134,7 +134,7 @@
     }
   }
 
-  // Check the input compiler filter against the generated oat file's filter. Mayb be overridden
+  // Check the input compiler filter against the generated oat file's filter. May be overridden
   // in subclasses when equality is not expected.
   virtual void CheckFilter(CompilerFilter::Filter expected, CompilerFilter::Filter actual) {
     EXPECT_EQ(expected, actual);
@@ -153,14 +153,7 @@
 
     std::vector<std::string> argv;
     argv.push_back(runtime->GetCompilerExecutable());
-    argv.push_back("--runtime-arg");
-    argv.push_back("-classpath");
-    argv.push_back("--runtime-arg");
-    std::string class_path = runtime->GetClassPathString();
-    if (class_path == "") {
-      class_path = OatFile::kSpecialSharedLibrary;
-    }
-    argv.push_back(class_path);
+
     if (runtime->IsJavaDebuggable()) {
       argv.push_back("--debuggable");
     }