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

tools/clang/blink_gc_plugin/NeedsTracing.h

Index: tools/clang/blink_gc_plugin/NeedsTracing.h
diff --git a/tools/clang/blink_gc_plugin/NeedsTracing.h b/tools/clang/blink_gc_plugin/NeedsTracing.h
deleted file mode 100644
index cf4c2c1f70af54aaa0bee4814cb50045c8613ea0..0000000000000000000000000000000000000000
--- a/tools/clang/blink_gc_plugin/NeedsTracing.h
+++ /dev/null
@@ -1,31 +0,0 @@
-// 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.
-
-// NeedsTracing is a three-point value ordered by unneeded < unknown < needed.
-// Unneeded means that the point definitively does not need to be traced.
-
-#ifndef TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_
-#define TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_
-
-class NeedsTracing {
- public:
-  static NeedsTracing Unneeded() { return kUnneeded; }
-  static NeedsTracing Unknown() { return kUnknown; }
-  static NeedsTracing Needed() { return kNeeded; }
-  bool IsUnneeded() { return value_ == kUnneeded; }
-  bool IsUnknown() { return value_ == kUnknown; }
-  bool IsNeeded() { return value_ == kNeeded; }
-  NeedsTracing LUB(const NeedsTracing& other) {
-    return value_ > other.value_ ? value_ : other.value_;
-  }
-  bool operator==(const NeedsTracing& other) {
-    return value_ == other.value_;
-  }
- private:
-  enum Value { kUnneeded, kUnknown, kNeeded };
-  NeedsTracing(Value value) : value_(value) {}
-  Value value_;
-};
-
-#endif // TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_