Revert of Store the list of trial tokens in OriginTrialContext

third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.h

Index: third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.h
diff --git a/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.h b/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.h
new file mode 100644
index 0000000000000000000000000000000000000000..a45587cff6e3b5615335651fb887db145261f9ff
--- /dev/null
+++ b/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.h
@@ -0,0 +1,41 @@
+// 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 DocumentOriginTrialContext_h
+#define DocumentOriginTrialContext_h
+
+#include "core/CoreExport.h"
+#include "core/dom/Document.h"
+#include "core/origin_trials/OriginTrialContext.h"
+#include "platform/heap/Handle.h"
+#include "wtf/Forward.h"
+#include <utility>
+
+namespace blink {
+
+class WebApiKeyValidator;
+
+// DocumentOriginTrialContext is a specialization of OriginTrialContext for
+// the Document execution context. It enables and disables feature trials based
+// on the tokens found in <meta> tags in the document header.
+class CORE_EXPORT DocumentOriginTrialContext : public OriginTrialContext {
+public:
+    explicit DocumentOriginTrialContext(Document*);
+    ~DocumentOriginTrialContext() override = default;
+
+    ExecutionContext* getExecutionContext() override { return m_parent; }
+    Vector<String> getTokens() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+protected:
+    friend class DocumentOriginTrialContextTest;
+
+private:
+    Member<Document> m_parent;
+};
+
+} // namespace blink
+
+#endif // DocumentOriginTrialContext_h