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..882ab09811670f59dc19c3892c9ff132a2dd70cd 100644
--- a/net/http/mock_http_cache.cc
+++ b/net/http/mock_http_cache.cc
@@ -91,6 +91,14 @@ int32 MockDiskEntry::GetDataSize(int index) const {
   return static_cast<int32>(data_[index].size());
 }
 
+int MockDiskEntry::GetEntrySize() const {
+  int result = 0;
+  for (int i = 0; i < kNumCacheEntryDataIndices; ++i) {
+    result += GetDataSize(i);
+  }
+  return result;
+}
+
 int MockDiskEntry::ReadData(int index,
                             int offset,
                             IOBuffer* buf,
@@ -477,6 +485,13 @@ 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,