Introduce String::fromUTF8Lenient() and use it for cache_name in CacheStorage API.

content/renderer/cache_storage/cache_storage_dispatcher.cc

Index: content/renderer/cache_storage/cache_storage_dispatcher.cc
diff --git a/content/renderer/cache_storage/cache_storage_dispatcher.cc b/content/renderer/cache_storage/cache_storage_dispatcher.cc
index b20d19eef385616c07c76395e915a49f151c3a8b..ad32e9d9b4819ecbb116383a8579b8944a1894af 100644
--- a/content/renderer/cache_storage/cache_storage_dispatcher.cc
+++ b/content/renderer/cache_storage/cache_storage_dispatcher.cc
@@ -99,7 +99,7 @@ CacheStorageCacheQueryParams QueryParamsFromWebQueryParams(
   query_params.ignore_search = web_query_params.ignoreSearch;
   query_params.ignore_method = web_query_params.ignoreMethod;
   query_params.ignore_vary = web_query_params.ignoreVary;
-  query_params.cache_name = web_query_params.cacheName;
+  query_params.cache_name = web_query_params.cacheName.utf8();
   return query_params;
 }
 
@@ -320,11 +320,11 @@ void CacheStorageDispatcher::OnCacheStorageDeleteSuccess(int thread_id,
 void CacheStorageDispatcher::OnCacheStorageKeysSuccess(
     int thread_id,
     int request_id,
-    const std::vector<base::string16>& keys) {
+    const std::vector<std::string>& keys) {
   DCHECK_EQ(thread_id, CurrentWorkerId());
   blink::WebVector<blink::WebString> webKeys(keys.size());
   for (size_t i = 0; i < keys.size(); ++i)
-    webKeys[i] = keys[i];
+    webKeys[i] = blink::WebString::fromUTF8Lenient(keys[i]);
 
   UMA_HISTOGRAM_TIMES("ServiceWorkerCache.CacheStorage.Keys",
                       TimeTicks::Now() - keys_times_[request_id]);
@@ -528,7 +528,7 @@ void CacheStorageDispatcher::dispatchHas(
   int request_id = has_callbacks_.Add(callbacks);
   has_times_[request_id] = base::TimeTicks::Now();
   Send(new CacheStorageHostMsg_CacheStorageHas(CurrentWorkerId(), request_id,
-                                               origin, cacheName));
+                                               origin, cacheName.utf8()));
 }
 
 void CacheStorageDispatcher::dispatchOpen(
@@ -538,7 +538,7 @@ void CacheStorageDispatcher::dispatchOpen(
   int request_id = open_callbacks_.Add(callbacks);
   open_times_[request_id] = base::TimeTicks::Now();
   Send(new CacheStorageHostMsg_CacheStorageOpen(CurrentWorkerId(), request_id,
-                                                origin, cacheName));
+                                                origin, cacheName.utf8()));
 }
 
 void CacheStorageDispatcher::dispatchDelete(
@@ -548,7 +548,7 @@ void CacheStorageDispatcher::dispatchDelete(
   int request_id = delete_callbacks_.Add(callbacks);
   delete_times_[request_id] = base::TimeTicks::Now();
   Send(new CacheStorageHostMsg_CacheStorageDelete(CurrentWorkerId(), request_id,
-                                                  origin, cacheName));
+                                                  origin, cacheName.utf8()));
 }
 
 void CacheStorageDispatcher::dispatchKeys(