Use ReadOnlyFile in web bundle parser

This is only read from: https://source.chromium.org/chromium/chromium/src/+/master:components/web_package/web_bundle_parser_factory.cc;drc=0e22286ee95d2bd711f81d73f1178343fbacc890;l=29

Bug: 1130762
Change-Id: I1859ab3cf91f8131190883479735fd1ca9acb608
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464205Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817540}

components/web_package/mojom/web_bundle_parser.mojom

@@ -4,7 +4,7 @@
 
 module web_package.mojom;
 
-import "mojo/public/mojom/base/file.mojom";
+import "mojo/public/mojom/base/read_only_file.mojom";
 import "url/mojom/url.mojom";
 
 // Factory interface to create WebBundleParser for the passed |file|
@@ -12,7 +12,7 @@ import "url/mojom/url.mojom";
 interface WebBundleParserFactory {
   // Constructs a parser for the passed |file|.
   GetParserForFile(pending_receiver<WebBundleParser> receiver,
-                   mojo_base.mojom.File file);
+                   mojo_base.mojom.ReadOnlyFile file);
 
   // Constructs a parser for the passed |data_source|.
   GetParserForDataSource(pending_receiver<WebBundleParser> receiver,