net: Update the include paths of base/string_piece.h to its new location.

net/android/keystore.h

 // 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.
 
 #ifndef NET_ANDROID_KEYSTORE_H
 #define NET_ANDROID_KEYSTORE_H
 
 #include <jni.h>
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/ssl/ssl_client_cert_type.h"
 
 // Avoid including <openssl/evp.h> here.
 typedef struct evp_pkey_st EVP_PKEY;
 
 // Misc functions to access the Android platform KeyStore.
 
 namespace net {
 namespace android {
@@ skipping 83 matching lines @@
 //       the returned key's reference count.
 EVP_PKEY* GetOpenSSLSystemHandleForPrivateKey(jobject private_key);
 
 // Register JNI methods
 NET_EXPORT bool RegisterKeyStore(JNIEnv* env);
 
 }  // namespace android
 }  // namespace net
 
 #endif  // NET_ANDROID_KEYSTORE_H