Use ReadOnlyFile in archive analyzer

The output or temp files do need to be writeable, but the input files
do not, e.g. https://source.chromium.org/chromium/chromium/src/+/master:chrome/services/file_util/public/cpp/sandboxed_zip_analyzer.cc;l=45;bpv=1;bpt=1

Bug: 1130762
Change-Id: I22773721de3ec35c920e45f3a1ec29e4a31d32dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486458Reviewed-by: Nathan Parker <nparker@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819946}

chrome/services/file_util/public/mojom/safe_archive_analyzer.mojom

@@ -9,24 +9,25 @@
 module chrome.mojom;
 
 import "mojo/public/mojom/base/file.mojom";
+import "mojo/public/mojom/base/read_only_file.mojom";
 
 interface SafeArchiveAnalyzer {
   // Build flag FULL_SAFE_BROWSING: Analyze the |zip_file| for malicious
   // download protection, given a |temporary_file| used to extract files
   // from the |zip_file| archive.
-  AnalyzeZipFile(mojo_base.mojom.File zip_file,
+  AnalyzeZipFile(mojo_base.mojom.ReadOnlyFile zip_file,
                  mojo_base.mojom.File temporary_file)
       => (SafeArchiveAnalyzerResults results);
 
   // Build flag FULL_SAFE_BROWSING, on OS_MAC: Analyze the |dmg_file|
   // for malicious download protection.
-  AnalyzeDmgFile(mojo_base.mojom.File dmg_file)
+  AnalyzeDmgFile(mojo_base.mojom.ReadOnlyFile dmg_file)
       => (SafeArchiveAnalyzerResults results);
 
   // Build flag FULL_SAFE_BROWSING: Analyze the |rar_file| for malicious
   // download protection. Uses the |temporary_file| to extract files from the
   // |rar_file| archive.
-  AnalyzeRarFile(mojo_base.mojom.File rar_file,
+  AnalyzeRarFile(mojo_base.mojom.ReadOnlyFile rar_file,
                  mojo_base.mojom.File temporary_file)
       => (SafeArchiveAnalyzerResults results);
 };