Blink GC plugin: disallow pure-virtual trace methods.

tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h

Index: tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h
diff --git a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h b/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h
index d0b67a3aada80b064775ab6963286e14e0a2f50e..b81f7e177bcef50257394085790ad9dfbb0be203 100644
--- a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h
+++ b/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef PURE_VIRTUAL_BASE_H_
-#define PURE_VIRTUAL_BASE_H_
+#ifndef PURE_VIRTUAL_TRACE_H_
+#define PURE_VIRTUAL_TRACE_H_
 
 #include "heap/stubs.h"
 
@@ -14,18 +14,6 @@ public:
     virtual void trace(Visitor*) = 0;
 };
 
-class B : public A {
-public:
-    // Does not need a trace method.
-};
-
-class C : public B {
-public:
-    void trace(Visitor*);
-private:
-    Member<A> m_a;
-};
-
 }
 
 #endif