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

content/public/test/test_file_system_options.cc

Index: content/public/test/test_file_system_options.cc
diff --git a/content/public/test/test_file_system_options.cc b/content/public/test/test_file_system_options.cc
index 81c4642b403c58d59f578b67d18018c6eb8c571a..825a13642ac100ab1513fd8741cfba659b11dd52 100644
--- a/content/public/test/test_file_system_options.cc
+++ b/content/public/test/test_file_system_options.cc
@@ -17,8 +17,9 @@ FileSystemOptions CreateIncognitoFileSystemOptions() {
   additional_allowed_schemes.push_back("chrome-extension");
 #endif
   return FileSystemOptions(FileSystemOptions::PROFILE_MODE_INCOGNITO,
-                           additional_allowed_schemes);
-};
+                           additional_allowed_schemes,
+                           NULL);
+}
 
 FileSystemOptions CreateAllowFileAccessOptions() {
   std::vector<std::string> additional_allowed_schemes;
@@ -27,8 +28,9 @@ FileSystemOptions CreateAllowFileAccessOptions() {
   additional_allowed_schemes.push_back("chrome-extension");
 #endif
   return FileSystemOptions(FileSystemOptions::PROFILE_MODE_NORMAL,
-                           additional_allowed_schemes);
-};
+                           additional_allowed_schemes,
+                           NULL);
+}
 
 FileSystemOptions CreateDisallowFileAccessOptions() {
   std::vector<std::string> additional_allowed_schemes;
@@ -36,7 +38,8 @@ FileSystemOptions CreateDisallowFileAccessOptions() {
   additional_allowed_schemes.push_back("chrome-extension");
 #endif
   return FileSystemOptions(FileSystemOptions::PROFILE_MODE_NORMAL,
-                           additional_allowed_schemes);
-};
+                           additional_allowed_schemes,
+                           NULL);
+}
 
 }  // namespace content