drive: Remove MD5 argument from FileCache::MarkDirty

chrome/browser/chromeos/drive/file_cache.h

Index: chrome/browser/chromeos/drive/file_cache.h
diff --git a/chrome/browser/chromeos/drive/file_cache.h b/chrome/browser/chromeos/drive/file_cache.h
index 777707798968ad70f0e37799e25319dd64ae040c..c576b7b78ed37b5fa01df45817956eeb77ae2266 100644
--- a/chrome/browser/chromeos/drive/file_cache.h
+++ b/chrome/browser/chromeos/drive/file_cache.h
@@ -200,12 +200,10 @@ class FileCache {
   // |callback| must not be null.
   // Must be called on the UI thread.
   void MarkDirtyOnUIThread(const std::string& resource_id,
-                           const std::string& md5,
                            const FileOperationCallback& callback);
 
   // Marks the specified entry dirty.
-  FileError MarkDirty(const std::string& resource_id,
-                      const std::string& md5);
+  FileError MarkDirty(const std::string& resource_id);
 
   // Clears dirty state of the specified entry.
   FileError ClearDirty(const std::string& resource_id,