Add FileSystemID parameter to IsolatedContext::RegisterFileSystemForPath.

content/browser/fileapi/file_system_context_unittest.cc

Index: content/browser/fileapi/file_system_context_unittest.cc
diff --git a/content/browser/fileapi/file_system_context_unittest.cc b/content/browser/fileapi/file_system_context_unittest.cc
index 099e30cc0951e5985e199df0f519f2d2caa305ff..e746a6a3ad38866c001797ac8963cceb94253feb 100644
--- a/content/browser/fileapi/file_system_context_unittest.cc
+++ b/content/browser/fileapi/file_system_context_unittest.cc
@@ -114,6 +114,7 @@ TEST_F(FileSystemContextTest, NullExternalMountPoints) {
   std::string isolated_id =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           fileapi::kFileSystemTypeNativeLocal,
+          std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_name);
   // Register system external mount point.
@@ -203,6 +204,7 @@ TEST_F(FileSystemContextTest, CrackFileSystemURL) {
   const std::string kIsolatedFileSystemID =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           fileapi::kFileSystemTypeNativeLocal,
+          std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_file_system_name);
   // Register system external mount point.
@@ -357,6 +359,7 @@ TEST_F(FileSystemContextTest, CanServeURLRequest) {
   std::string isolated_fs_id =
       IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           fileapi::kFileSystemTypeNativeLocal,
+          std::string(),
           base::FilePath(DRIVE FPL("/test/isolated/root")),
           &isolated_fs_name);
   cracked_url = context->CrackURL(