Revert of Implement cache counting for the simple and memory backends.

net/disk_cache/simple/simple_backend_impl.cc

Index: net/disk_cache/simple/simple_backend_impl.cc
diff --git a/net/disk_cache/simple/simple_backend_impl.cc b/net/disk_cache/simple/simple_backend_impl.cc
index d1c111eccf0372f7f35338cd6e750bd90dfd048e..f985e58ae89f292cf7c46a6adce8cc296c7d5f88 100644
--- a/net/disk_cache/simple/simple_backend_impl.cc
+++ b/net/disk_cache/simple/simple_backend_impl.cc
@@ -442,6 +442,19 @@
   return DoomEntriesBetween(Time(), Time(), callback);
 }
 
+void SimpleBackendImpl::IndexReadyForDoom(Time initial_time,
+                                          Time end_time,
+                                          const CompletionCallback& callback,
+                                          int result) {
+  if (result != net::OK) {
+    callback.Run(result);
+    return;
+  }
+  scoped_ptr<std::vector<uint64> > removed_key_hashes(
+      index_->GetEntriesBetween(initial_time, end_time).release());
+  DoomEntries(removed_key_hashes.get(), callback);
+}
+
 int SimpleBackendImpl::DoomEntriesBetween(
     const Time initial_time,
     const Time end_time,
@@ -459,8 +472,8 @@
 
 int SimpleBackendImpl::CalculateSizeOfAllEntries(
     const CompletionCallback& callback) {
-  return index_->ExecuteWhenReady(base::Bind(
-      &SimpleBackendImpl::IndexReadyForSizeCalculation, AsWeakPtr(), callback));
+  // TODO(msramek): Implement.
+  return net::ERR_NOT_IMPLEMENTED;
 }
 
 class SimpleBackendImpl::SimpleIterator final : public Iterator {
@@ -557,27 +570,6 @@
   callback.Run(result.net_error);
 }
 
-void SimpleBackendImpl::IndexReadyForDoom(Time initial_time,
-                                          Time end_time,
-                                          const CompletionCallback& callback,
-                                          int result) {
-  if (result != net::OK) {
-    callback.Run(result);
-    return;
-  }
-  scoped_ptr<std::vector<uint64>> removed_key_hashes(
-      index_->GetEntriesBetween(initial_time, end_time).release());
-  DoomEntries(removed_key_hashes.get(), callback);
-}
-
-void SimpleBackendImpl::IndexReadyForSizeCalculation(
-    const CompletionCallback& callback,
-    int result) {
-  if (result == net::OK)
-    result = static_cast<int>(index_->GetCacheSize());
-  callback.Run(result);
-}
-
 SimpleBackendImpl::DiskStatResult SimpleBackendImpl::InitCacheStructureOnDisk(
     const base::FilePath& path,
     uint64 suggested_max_size) {