Improve EnterpriseInstallAttributes::ReadCacheFile() doc.

chrome/browser/chromeos/policy/enterprise_install_attributes.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_POLICY_ENTERPRISE_INSTALL_ATTRIBUTES_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_ENTERPRISE_INSTALL_ATTRIBUTES_H_
 
 #include <map>
 #include <string>
 
@@ skipping 36 matching lines @@
   static const char kAttrEnterpriseDomain[];
   static const char kAttrEnterpriseMode[];
   static const char kAttrEnterpriseOwned[];
   static const char kAttrEnterpriseUser[];
   static const char kAttrConsumerKioskEnabled[];
 
   explicit EnterpriseInstallAttributes(
       chromeos::CryptohomeClient* cryptohome_client);
   ~EnterpriseInstallAttributes();
 
-  // Reads data from the cache file. The cache file is used to work around slow
-  // cryptohome startup, which takes a while to register its DBus interface.
-  // See http://crosbug.com/37367 for background on this.
+  // Reads data from the cache file which is created early during the boot
+  // process.  The cache file is used to work around slow cryptohome startup,
+  // which takes a while to register its DBus interface.  See
+  // http://crosbug.com/37367 for background on this.
   void ReadCacheFile(const base::FilePath& cache_file);
 
   // Makes sure the local caches for enterprise-related install attributes are
   // up-to-date with what cryptohome has. This method checks the readiness of
   // attributes and read them if ready. Actual read will be performed in
   // ReadAttributesIfReady().
   void ReadImmutableAttributes(const base::Closure& callback);
 
   // Locks the device to be an enterprise device registered by the given user.
   // This can also be called after the lock has already been taken, in which
@@ skipping 62 matching lines @@
   chromeos::CryptohomeClient* cryptohome_client_;
 
   base::WeakPtrFactory<EnterpriseInstallAttributes> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnterpriseInstallAttributes);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_ENTERPRISE_INSTALL_ATTRIBUTES_H_