Move the iOS user agent functions to ios/web/public.

ios/web/public/user_agent.h

Index: ios/web/public/user_agent.h
diff --git a/ios/web/public/user_agent.h b/ios/web/public/user_agent.h
new file mode 100644
index 0000000000000000000000000000000000000000..8b97874b751027976e43fcde69bb207deeae7cc1
--- /dev/null
+++ b/ios/web/public/user_agent.h
@@ -0,0 +1,19 @@
+// 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.
+
+#ifndef IOS_WEB_PUBLIC_USER_AGENT_H_
+#define IOS_WEB_PUBLIC_USER_AGENT_H_
+
+#include <string>
+
+namespace web {
+
+// Helper function to generate a full user agent string from a short
+// product name.

[stuartmorgan, 2014/07/07 18:43:57]

Replace with:
// Returns the user agent to use for the given product name.
// The returned user agent is very similar to that used by Mobile Safari, for
web page compatibility.

[rohitrao (ping after 24h), 2014/07/07 18:57:05]

Done.

+std::string BuildUserAgentFromProduct(
+    const std::string& product);
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_USER_AGENT_H_