Add a size estimation mechanism to StoragePartitionHttpCacheDataRemover.

net/http/mock_http_cache.cc

Index: net/http/mock_http_cache.cc
diff --git a/net/http/mock_http_cache.cc b/net/http/mock_http_cache.cc
index d939a3d8f9692f9f6c8eeddeda0e97dd1ccc38ca..6b40107210b40ba746fcee249f246250ed251e6e 100644
--- a/net/http/mock_http_cache.cc
+++ b/net/http/mock_http_cache.cc
@@ -477,6 +477,13 @@ int MockDiskCache::DoomEntriesSince(const base::Time initial_time,
   return ERR_NOT_IMPLEMENTED;
 }
 
+int MockDiskCache::CalculateSizeOfEntriesBetween(
+    base::Time initial_time,
+    base::Time end_time,
+    const CompletionCallback& callback) {
+  return ERR_NOT_IMPLEMENTED;
+}
+
 class MockDiskCache::NotImplementedIterator : public Iterator {
  public:
   int OpenNextEntry(disk_cache::Entry** next_entry,