Implement rewrite logic for assigning a temporary scoped_refptr to T*.

tools/clang/rewrite_scoped_refptr/tests/temp-passed-as-raw-arg-expected.cc

Index: tools/clang/rewrite_scoped_refptr/tests/temp-passed-as-raw-arg-expected.cc
diff --git a/tools/clang/rewrite_scoped_refptr/tests/temp-passed-as-raw-arg-expected.cc b/tools/clang/rewrite_scoped_refptr/tests/temp-passed-as-raw-arg-expected.cc
new file mode 100644
index 0000000000000000000000000000000000000000..803db29f9fd54b44b6d4304c8fa59f34e82d2db4
--- /dev/null
+++ b/tools/clang/rewrite_scoped_refptr/tests/temp-passed-as-raw-arg-expected.cc
@@ -0,0 +1,24 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "scoped_refptr.h"
+
+struct Foo {
+  int dummy;
+};
+
+// A temporary scoped_refptr is unsafely passed as a function argument. Since
+// temporaries are destroyed at the end of the full expression, this is 'safe'
+// and can be rewritten to use get(). Currently, the tool just skips this case
+// though--hopefully this is rare enough that manual intervention is not really
+// required.
+scoped_refptr<Foo> GetBuggyFoo() {
+  return new Foo;
+}
+
+void Bar(Foo* f);
+
+void UseBuggyFoo() {
+  Bar(GetBuggyFoo());
+}