Remove tools/clang (this will break things temporarily).

tools/clang/blink_gc_plugin/CheckGCRootsVisitor.h

Index: tools/clang/blink_gc_plugin/CheckGCRootsVisitor.h
diff --git a/tools/clang/blink_gc_plugin/CheckGCRootsVisitor.h b/tools/clang/blink_gc_plugin/CheckGCRootsVisitor.h
deleted file mode 100644
index b3cede16f9109ad7cd2554cd6be228b4c786804b..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/CheckGCRootsVisitor.h
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef TOOLS_BLINK_GC_PLUGIN_CHECK_GC_ROOTS_VISITOR_H_
-#define TOOLS_BLINK_GC_PLUGIN_CHECK_GC_ROOTS_VISITOR_H_
-
-#include <set>
-#include <vector>
-
-#include "Edge.h"
-#include "RecordInfo.h"
-
-// This visitor checks that the fields of a class and the fields of
-// its part objects don't define GC roots.
-class CheckGCRootsVisitor : public RecursiveEdgeVisitor {
- public:
-  typedef std::vector<FieldPoint*> RootPath;
-  typedef std::set<RecordInfo*> VisitingSet;
-  typedef std::vector<RootPath> Errors;
-
-  CheckGCRootsVisitor();
-
-  Errors& gc_roots();
-
-  bool ContainsGCRoots(RecordInfo* info);
-
-  void VisitValue(Value* edge) override;
-  void VisitPersistent(Persistent* edge) override;
-  void AtCollection(Collection* edge) override;
-
- private:
-  RootPath current_;
-  VisitingSet visiting_set_;
-  Errors gc_roots_;
-};
-
-#endif  // TOOLS_BLINK_GC_PLUGIN_CHECK_GC_ROOTS_VISITOR_H_