[FileAPI] Replace default leveldb::Env with leveldb::MemEnv in tests.

webkit/browser/fileapi/sandbox_prioritized_origin_database.cc

Index: webkit/browser/fileapi/sandbox_prioritized_origin_database.cc
diff --git a/webkit/browser/fileapi/sandbox_prioritized_origin_database.cc b/webkit/browser/fileapi/sandbox_prioritized_origin_database.cc
index 06a44a07080362a68d18d86d57903f482cbb6513..a17ba957d9fbd0ec3c356373382d7b25502cc3ff 100644
--- a/webkit/browser/fileapi/sandbox_prioritized_origin_database.cc
+++ b/webkit/browser/fileapi/sandbox_prioritized_origin_database.cc
@@ -57,8 +57,10 @@ bool ReadPrimaryOriginFile(const base::FilePath& path,
 }  // namespace
 
 SandboxPrioritizedOriginDatabase::SandboxPrioritizedOriginDatabase(
-    const base::FilePath& file_system_directory)
+    const base::FilePath& file_system_directory,
+    leveldb::Env* env_override)
     : file_system_directory_(file_system_directory),
+      env_override_(env_override),
       primary_origin_file_(
           file_system_directory_.Append(kPrimaryOriginFile)) {
 }
@@ -213,7 +215,8 @@ void SandboxPrioritizedOriginDatabase::MaybeInitializeNonPrimaryDatabase(
   if (origin_database_)
     return;
 
-  origin_database_.reset(new SandboxOriginDatabase(file_system_directory_));
+  origin_database_.reset(new SandboxOriginDatabase(file_system_directory_,
+                                                   env_override_));
   if (!create && !base::DirectoryExists(origin_database_->GetDatabasePath())) {
     origin_database_.reset();
     return;