Use UtilityProcessHost to patch files.

chrome/utility/chrome_content_utility_client.h

Index: chrome/utility/chrome_content_utility_client.h
diff --git a/chrome/utility/chrome_content_utility_client.h b/chrome/utility/chrome_content_utility_client.h
index 4f6b33f2932301c50dfddf08150cf2ec66c7f19d..ad7c9535fb5ffecd3d51fb1379e40b5ba5844144 100644
--- a/chrome/utility/chrome_content_utility_client.h
+++ b/chrome/utility/chrome_content_utility_client.h
@@ -92,6 +92,12 @@ class ChromeContentUtilityClient : public content::ContentUtilityClient {
 
   void OnGetPrinterCapsAndDefaults(const std::string& printer_name);
   void OnGetPrinterSemanticCapsAndDefaults(const std::string& printer_name);
+  void OnPatchFileBsdiff(const base::FilePath& input_file,
+                         const base::FilePath& patch_file,
+                         const base::FilePath& output_file);
+  void OnPatchFileCourgette(const base::FilePath& input_file,
+                            const base::FilePath& patch_file,
+                            const base::FilePath& output_file);
   void OnStartupPing();
   void OnAnalyzeZipFileForDownloadProtection(
       const IPC::PlatformFileForTransit& zip_file);