gdata: Remove sub_dir_type from CacheEntry for simplicity

chrome/browser/chromeos/gdata/gdata_cache_metadata.h

Index: chrome/browser/chromeos/gdata/gdata_cache_metadata.h
diff --git a/chrome/browser/chromeos/gdata/gdata_cache_metadata.h b/chrome/browser/chromeos/gdata/gdata_cache_metadata.h
index e0c808138c1691aaa0c5799604ac211d2c1525d6..e45132c49c4142419e9db0c76566e278141c9828 100644
--- a/chrome/browser/chromeos/gdata/gdata_cache_metadata.h
+++ b/chrome/browser/chromeos/gdata/gdata_cache_metadata.h
@@ -40,7 +40,6 @@ class GDataCacheMetadata {
   // Creates new entry if it doesn't exist, otherwise update the entry.
   virtual void UpdateCache(const std::string& resource_id,
                            const std::string& md5,
-                           GDataCache::CacheSubDirectoryType subdir,
                            int cache_state) = 0;
 
   // Removes entry corresponding to |resource_id| from cache map.
@@ -88,7 +87,6 @@ class GDataCacheMetadataMap : public GDataCacheMetadata {
   // GDataCacheMetadata overrides:
   virtual void UpdateCache(const std::string& resource_id,
                            const std::string& md5,
-                           GDataCache::CacheSubDirectoryType subdir,
                            int cache_state) OVERRIDE;
   virtual void RemoveFromCache(const std::string& resource_id) OVERRIDE;
   virtual scoped_ptr<GDataCache::CacheEntry> GetCacheEntry(