Move DnsApiTest.DnsResolveIPLiteral and DnsApiTest.DnsResolveHostname to app_shell_browsertests.

extensions/browser/api/dns/host_resolver_wrapper.h

 // 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 EXTENSIONS_BROWSER_API_DNS_HOST_RESOLVER_WRAPPER_H_
 #define EXTENSIONS_BROWSER_API_DNS_HOST_RESOLVER_WRAPPER_H_
 
 #include "base/memory/singleton.h"
-#include "net/dns/host_resolver.h"
+
+namespace content {
+class ResourceContext;
+}
+
+namespace net {
+class HostResolver;
+}
 
 namespace extensions {
 
 // Used for testing. In production code, this class does nothing interesting.
 // This class is a singleton that holds a pointer to a mock HostResolver, or
 // else to NULL. API classes that need to resolve hostnames ask this class for
 // the correct HostResolver to use, passing in the one that they want to use,
 // thereby avoiding most lifetime issues, and it will reply with either that
 // same one, or else the test version to use instead.
 //
 // This is a pretty complicated way to replace a single pointer with another.
 // TODO(miket): make the previous statement obsolete.
 class HostResolverWrapper {
  public:
   static HostResolverWrapper* GetInstance();
 
-  // Given a pointer to a real host resolver, returns the same pointer or else
-  // a substitute MockHostResolver to use instead. If
-  // SetHostResolverForTesting() hasn't been called, then this method returns
-  // the supplied argument as its result.
-  net::HostResolver* GetHostResolver(net::HostResolver* real_resolver);
+  // Given a pointer to a ResourceContext, returns its HostResolver if
+  // SetHostResolverForTesting() hasn't been called, or else a
+  // a substitute MockHostResolver to use instead.
+  net::HostResolver* GetHostResolver(content::ResourceContext* context);
 
   // Sets the MockHostResolver to return in GetHostResolver().
   void SetHostResolverForTesting(net::HostResolver* mock_resolver);
 
  private:
   HostResolverWrapper();
   friend struct DefaultSingletonTraits<HostResolverWrapper>;
 
   net::HostResolver* resolver_;
 
   DISALLOW_COPY_AND_ASSIGN(HostResolverWrapper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DNS_HOST_RESOLVER_WRAPPER_H_