ART: Fix tidy warnings

Switch to char versions of find variants.

Add "explicit" constructor variants or refactor and
remove defaults.

Use const references.

Bug: 32619234
Test: m test-art-host
Change-Id: I970cc2f47d6cf8f0c74104b994b075b2fafb3d45
diff --git a/dex2oat/dex2oat_test.cc b/dex2oat/dex2oat_test.cc
index 58dd047..fa32178 100644
--- a/dex2oat/dex2oat_test.cc
+++ b/dex2oat/dex2oat_test.cc
@@ -438,9 +438,7 @@
 
     Copy(GetDexSrc1(), dex_location);
 
-    std::vector<std::string> copy(extra_args);
-
-    GenerateOdexForTest(dex_location, odex_location, filter, copy);
+    GenerateOdexForTest(dex_location, odex_location, filter, extra_args);
 
     CheckValidity();
     ASSERT_TRUE(success_);