Revert of Store the list of trial tokens in OriginTrialContext

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

Index: third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.cpp
diff --git a/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.cpp b/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f43bceb75ad03fd93113aff79c62606a26fa884c
--- /dev/null
+++ b/third_party/WebKit/Source/core/origin_trials/DocumentOriginTrialContext.cpp
@@ -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.
+
+#include "core/origin_trials/DocumentOriginTrialContext.h"
+
+#include "core/dom/ElementTraversal.h"
+#include "core/html/HTMLHeadElement.h"
+#include "core/html/HTMLMetaElement.h"
+
+namespace blink {
+
+class Document;
+
+DocumentOriginTrialContext::DocumentOriginTrialContext(Document* document)
+    : m_parent(document)
+{
+}
+
+Vector<String> DocumentOriginTrialContext::getTokens()
+{
+    // When in a document, the tokens are provided in a meta tag
+    Vector<String> tokens;
+    HTMLHeadElement* head = m_parent->head();
+    if (head) {
+        for (HTMLMetaElement& metaElement : Traversal<HTMLMetaElement>::childrenOf(*head)) {
+            if (equalIgnoringCase(metaElement.httpEquiv(), kTrialHeaderName)) {
+                tokens.append(metaElement.content());
+            }
+        }
+    }
+    return tokens;
+}
+
+DEFINE_TRACE(DocumentOriginTrialContext)
+{
+    visitor->trace(m_parent);
+    OriginTrialContext::trace(visitor);
+}
+
+} // namespace blink