Do not create a new directory database for read operations.

webkit/fileapi/obfuscated_file_system_file_util.h

Index: webkit/fileapi/obfuscated_file_system_file_util.h
diff --git a/webkit/fileapi/obfuscated_file_system_file_util.h b/webkit/fileapi/obfuscated_file_system_file_util.h
index 88caa65c555df57b790b1c00421f353590a12607..6e1d01c12eea5e9117098aeda842d16a8b37903e 100644
--- a/webkit/fileapi/obfuscated_file_system_file_util.h
+++ b/webkit/fileapi/obfuscated_file_system_file_util.h
@@ -48,7 +48,7 @@ class ObfuscatedFileSystemFileUtil : public FileSystemFileUtil,
     public base::RefCountedThreadSafe<ObfuscatedFileSystemFileUtil> {
  public:
 
-  ObfuscatedFileSystemFileUtil(const FilePath& file_system_directory);
+  explicit ObfuscatedFileSystemFileUtil(const FilePath& file_system_directory);
   virtual ~ObfuscatedFileSystemFileUtil();
 
   virtual base::PlatformFileError CreateOrOpen(
@@ -212,8 +212,11 @@ class ObfuscatedFileSystemFileUtil : public FileSystemFileUtil,
   // This does the reverse of DataPathToLocalPath.
   FilePath LocalPathToDataPath(
       const GURL& origin, FileSystemType type, const FilePath& local_path);
+  // This returns NULL if |create| flag is false and a filesystem does not
+  // exist for the given |origin_url| and |type|.
+  // For read operations |create| should be false.
   FileSystemDirectoryDatabase* GetDirectoryDatabase(
-      const GURL& origin_url, FileSystemType type);
+      const GURL& origin_url, FileSystemType type, bool create);
   void MarkUsed();
   void DropDatabases();
   bool DestroyDirectoryDatabase(const GURL& origin, FileSystemType type);