Introduce new files ios/chrome/common/chrome_constants.{cc,h}.

ios/chrome/browser/chrome_constants.cc

+// 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 "ios/chrome/browser/chrome_constants.h"
+
+const char kIOSChromeInitialBrowserState[] = "Default";
+const char kIOSChromeMultiBrowserStatePrefix[] = "Profile ";
+
+const base::FilePath::CharType kIOSChromeCacheDirname[] =
+    FILE_PATH_LITERAL("Cache");
+const base::FilePath::CharType kIOSChromeChannelIDFilename[] =
+    FILE_PATH_LITERAL("Origin Bound Certs");
+const base::FilePath::CharType kIOSChromeCookieFilename[] =
+    FILE_PATH_LITERAL("Cookies");
+const base::FilePath::CharType kIOSChromeCRLSetFilename[] =
+    FILE_PATH_LITERAL("Certificate Revocation Lists");
+const base::FilePath::CharType kIOSChromeNetworkPersistentStateFilename[] =
+    FILE_PATH_LITERAL("Network Persistent State");