Update from https://crrev.com/303153

net/disk_cache/simple/simple_index_unittest.cc

Index: net/disk_cache/simple/simple_index_unittest.cc
diff --git a/net/disk_cache/simple/simple_index_unittest.cc b/net/disk_cache/simple/simple_index_unittest.cc
index e5d0830c22dbba438ae1af0c5707b087e0b974d5..1096488448af02b669382e4770d18315459680d4 100644
--- a/net/disk_cache/simple/simple_index_unittest.cc
+++ b/net/disk_cache/simple/simple_index_unittest.cc
@@ -68,7 +68,8 @@ class MockSimpleIndexFile : public SimpleIndexFile,
   void WriteToDisk(const SimpleIndex::EntrySet& entry_set,
                    uint64 cache_size,
                    const base::TimeTicks& start,
-                   bool app_on_background) override {
+                   bool app_on_background,
+                   const base::Closure& callback) override {
     disk_writes_++;
     disk_write_entry_set_ = entry_set;
   }