Revert "Compile FileCache related drive components only on Chrome OS."

This reverts commit 1409407a93075f8ef9e894455ca75059ee68f99b.

See crbug.com/574709 for more details.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=yawano@chromium.org,thestig@chromium.org,hashimoto@chromium.org,satorux@chromium.org
BUG=574709,533750

Review URL: https://codereview.chromium.org/1561103002

Cr-Commit-Position: refs/heads/master@{#367814}

1 files changed, 34 insertions, 0 deletions

diff --git a/components/drive/remove_stale_cache_files.cc b/components/drive/remove_stale_cache_files.cc
new file mode 100644
index 0000000..93cab01
--- /dev/null
+++ b/components/drive/remove_stale_cache_files.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/drive/remove_stale_cache_files.h"
+
+#include "base/logging.h"
+#include "components/drive/drive.pb.h"
+#include "components/drive/file_cache.h"
+#include "components/drive/resource_metadata.h"
+
+namespace drive {
+namespace internal {
+
+void RemoveStaleCacheFiles(FileCache* cache,
+                           ResourceMetadata* resource_metadata) {
+  scoped_ptr<ResourceMetadata::Iterator> it = resource_metadata->GetIterator();
+  for (; !it->IsAtEnd(); it->Advance()) {
+    const ResourceEntry& entry = it->GetValue();
+    const FileCacheEntry& cache_state =
+        entry.file_specific_info().cache_state();
+    // Stale = not dirty but the MD5 does not match.
+    if (!cache_state.is_dirty() &&
+        cache_state.md5() != entry.file_specific_info().md5()) {
+      FileError error = cache->Remove(it->GetID());
+      LOG_IF(WARNING, error != FILE_ERROR_OK)
+          << "Failed to remove a stale cache file. resource_id: "
+          << it->GetID();
+    }
+  }
+}
+
+}  // namespace internal
+}  // namespace drive