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

tools/clang/blink_gc_plugin/CheckFieldsVisitor.h

Index: tools/clang/blink_gc_plugin/CheckFieldsVisitor.h
diff --git a/tools/clang/blink_gc_plugin/CheckFieldsVisitor.h b/tools/clang/blink_gc_plugin/CheckFieldsVisitor.h
deleted file mode 100644
index e0c36a2d89d128849e2588362e80b0d8e2ae4ebc..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/CheckFieldsVisitor.h
+++ /dev/null
@@ -1,62 +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_FIELDS_VISITOR_H_
-#define TOOLS_BLINK_GC_PLUGIN_CHECK_FIELDS_VISITOR_H_
-
-#include <vector>
-
-#include "Edge.h"
-
-struct BlinkGCPluginOptions;
-class FieldPoint;
-
-// This visitor checks that the fields of a class are "well formed".
-// - OwnPtr, RefPtr and RawPtr must not point to a GC derived types.
-// - Part objects must not be GC derived types.
-// - An on-heap class must never contain GC roots.
-// - Only stack-allocated types may point to stack-allocated types.
-
-class CheckFieldsVisitor : public RecursiveEdgeVisitor {
- public:
-  enum Error {
-    kRawPtrToGCManaged,
-    kRawPtrToGCManagedWarning,
-    kRefPtrToGCManaged,
-    kReferencePtrToGCManaged,
-    kReferencePtrToGCManagedWarning,
-    kOwnPtrToGCManaged,
-    kMemberToGCUnmanaged,
-    kMemberInUnmanaged,
-    kPtrFromHeapToStack,
-    kGCDerivedPartObject
-  };
-
-  typedef std::vector<std::pair<FieldPoint*, Error> > Errors;
-
-  explicit CheckFieldsVisitor(const BlinkGCPluginOptions& options);
-
-  Errors& invalid_fields();
-
-  bool ContainsInvalidFields(RecordInfo* info);
-
-  void AtMember(Member* edge) override;
-  void AtValue(Value* edge) override;
-  void AtCollection(Collection* edge) override;
-
-  static bool IsWarning(Error error);
-  static bool IsRawPtrError(Error error);
-  static bool IsReferencePtrError(Error error);
-
- private:
-  Error InvalidSmartPtr(Edge* ptr);
-
-  const BlinkGCPluginOptions& options_;
-  FieldPoint* current_;
-  bool stack_allocated_host_;
-  bool managed_host_;
-  Errors invalid_fields_;
-};
-
-#endif  // TOOLS_BLINK_GC_PLUGIN_CHECK_FIELDS_VISITOR_H_