Change MockBrowsingDataRemover to MockBrowsingDataRemoverDelegate

components/browsing_data/content/storage_partition_http_cache_data_remover.cc

Index: components/browsing_data/content/storage_partition_http_cache_data_remover.cc
diff --git a/components/browsing_data/content/storage_partition_http_cache_data_remover.cc b/components/browsing_data/content/storage_partition_http_cache_data_remover.cc
index 5eeff79f1ecb2ceb9dbaae2872f6d8fde8efa9e9..85194862f72d771c3b90a5f75b68ad09744e93c4 100644
--- a/components/browsing_data/content/storage_partition_http_cache_data_remover.cc
+++ b/components/browsing_data/content/storage_partition_http_cache_data_remover.cc
@@ -83,8 +83,6 @@ void StoragePartitionHttpCacheDataRemover::ClearHttpCacheOnIOThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   next_cache_state_ = CacheState::NONE;
   DCHECK_EQ(CacheState::NONE, next_cache_state_);
-  DCHECK(main_context_getter_.get());
-  DCHECK(media_context_getter_.get());
 
   next_cache_state_ = CacheState::CREATE_MAIN;
   DoClearCache(net::OK);
@@ -111,6 +109,15 @@ void StoragePartitionHttpCacheDataRemover::DoClearCache(int rv) {
             (next_cache_state_ == CacheState::CREATE_MAIN)
                 ? main_context_getter_.get()
                 : media_context_getter_.get();
+
+        // Caches might not exist in tests.
+        if (!getter) {
+          next_cache_state_ = (next_cache_state_ == CacheState::CREATE_MAIN)
+                                  ? CacheState::CREATE_MEDIA
+                                  : CacheState::DONE;
+          break;
+        }
+
         net::HttpCache* http_cache = getter->GetURLRequestContext()
                                          ->http_transaction_factory()
                                          ->GetCache();