Use string16 for cache_name in the back end of CacheStorage.

content/browser/cache_storage/cache_storage_manager.cc

Index: content/browser/cache_storage/cache_storage_manager.cc
diff --git a/content/browser/cache_storage/cache_storage_manager.cc b/content/browser/cache_storage/cache_storage_manager.cc
index 781df6451e1e4107b018607569747a1c89c9140b..4c5e0485ed6a857227019f2bdb6b72c030b58d27 100644
--- a/content/browser/cache_storage/cache_storage_manager.cc
+++ b/content/browser/cache_storage/cache_storage_manager.cc
@@ -152,7 +152,7 @@ CacheStorageManager::~CacheStorageManager() = default;
 
 void CacheStorageManager::OpenCache(
     const GURL& origin,
-    const std::string& cache_name,
+    const base::string16& cache_name,
     const CacheStorage::CacheAndErrorCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
@@ -163,7 +163,7 @@ void CacheStorageManager::OpenCache(
 
 void CacheStorageManager::HasCache(
     const GURL& origin,
-    const std::string& cache_name,
+    const base::string16& cache_name,
     const CacheStorage::BoolAndErrorCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
@@ -173,7 +173,7 @@ void CacheStorageManager::HasCache(
 
 void CacheStorageManager::DeleteCache(
     const GURL& origin,
-    const std::string& cache_name,
+    const base::string16& cache_name,
     const CacheStorage::BoolAndErrorCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
@@ -193,7 +193,7 @@ void CacheStorageManager::EnumerateCaches(
 
 void CacheStorageManager::MatchCache(
     const GURL& origin,
-    const std::string& cache_name,
+    const base::string16& cache_name,
     scoped_ptr<ServiceWorkerFetchRequest> request,
     const CacheStorageCache::ResponseCallback& callback) {
   CacheStorage* cache_storage = FindOrCreateCacheStorage(origin);