Move <webview> API to chrome layer

chrome/renderer/browser_plugin/chrome_webview_constants.cc

Index: chrome/renderer/browser_plugin/chrome_webview_constants.cc
diff --git a/chrome/renderer/browser_plugin/chrome_webview_constants.cc b/chrome/renderer/browser_plugin/chrome_webview_constants.cc
new file mode 100644
index 0000000000000000000000000000000000000000..48cccb527a09e3d9aaac4adf291e04aab70d7bf2
--- /dev/null
+++ b/chrome/renderer/browser_plugin/chrome_webview_constants.cc
@@ -0,0 +1,20 @@
+// Copyright (c) 2013 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 "chrome/renderer/browser_plugin/chrome_webview_constants.h"
+
+namespace chrome {
+
+namespace webview {
+
+// Method bindings.
+const char kMethodBack[] = "back";
+const char kMethodForward[] = "forward";
+const char kMethodGo[] = "go";
+const char kMethodReload[] = "reload";
+const char kMethodStop[] = "stop";
+
+}  // namespace webview
+
+}  // namespace chrome