Use string16 for cache_name in the back end of CacheStorage.

content/browser/cache_storage/cache_storage_manager.h

Index: content/browser/cache_storage/cache_storage_manager.h
diff --git a/content/browser/cache_storage/cache_storage_manager.h b/content/browser/cache_storage/cache_storage_manager.h
index 3ae3da80a87223da8fe2f0abe49480dfe7e7741b..f0ff35df0148239e8c4c08792b08f62cad560143 100644
--- a/content/browser/cache_storage/cache_storage_manager.h
+++ b/content/browser/cache_storage/cache_storage_manager.h
@@ -11,6 +11,7 @@
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/strings/string16.h"
 #include "content/browser/cache_storage/cache_storage.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/cache_storage_context.h"
@@ -55,18 +56,18 @@ class CONTENT_EXPORT CacheStorageManager {
   // Methods to support the CacheStorage spec. These methods call the
   // corresponding CacheStorage method on the appropriate thread.
   void OpenCache(const GURL& origin,
-                 const std::string& cache_name,
+                 const base::string16& cache_name,
                  const CacheStorage::CacheAndErrorCallback& callback);
   void HasCache(const GURL& origin,
-                const std::string& cache_name,
+                const base::string16& cache_name,
                 const CacheStorage::BoolAndErrorCallback& callback);
   void DeleteCache(const GURL& origin,
-                   const std::string& cache_name,
+                   const base::string16& cache_name,
                    const CacheStorage::BoolAndErrorCallback& callback);
   void EnumerateCaches(const GURL& origin,
                        const CacheStorage::StringsAndErrorCallback& callback);
   void MatchCache(const GURL& origin,
-                  const std::string& cache_name,
+                  const base::string16& cache_name,
                   scoped_ptr<ServiceWorkerFetchRequest> request,
                   const CacheStorageCache::ResponseCallback& callback);
   void MatchAllCaches(const GURL& origin,