Blink GC plugin: disallow pure-virtual trace methods.

tools/clang/blink_gc_plugin/RecordInfo.h

 // Copyright 2014 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.
 
 // This file provides a wrapper for CXXRecordDecl that accumulates GC related
 // information about a class. Accumulated information is memoized and the info
 // objects are stored in a RecordCache.
 
 #ifndef TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_
 #define TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_
@@ skipping 91 matching lines @@
   TracingStatus NeedsTracing(Edge::NeedsTracingOption);
   clang::CXXMethodDecl* InheritsNonVirtualTrace();
   bool IsConsideredAbstract();
 
  private:
   RecordInfo(clang::CXXRecordDecl* record, RecordCache* cache);
 
   Fields* CollectFields();
   Bases* CollectBases();
   void DetermineTracingMethods();
-  bool InheritsNonPureTrace();
+  bool InheritsTrace();
 
   Edge* CreateEdge(const clang::Type* type);
 
   RecordCache* cache_;
   clang::CXXRecordDecl* record_;
   const std::string name_;
   TracingStatus fields_need_tracing_;
   Bases* bases_;
   Fields* fields_;
 
@@ skipping 44 matching lines @@
       }
     }
   }
 
  private:
   typedef std::map<clang::CXXRecordDecl*, RecordInfo> Cache;
   Cache cache_;
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_RECORD_INFO_H_