[Office fallback] Mojo-bind fallback page handler independently from ODFS installed

Bug: b:324579786, b:325980155
Change-Id: Id1a69289a02cb9e4f405f65d21f8614a7d2b4b4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5312255
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Alexander Bolodurin <alexbn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1263682}

chrome/browser/ash/file_manager/file_tasks_browsertest.cc

@@ -1319,9 +1319,6 @@ class DriveTest : public TestAccountBrowserTest {
     // the office fallback dialog can launched.
     test::AddDefaultComponentExtensionsOnMainThread(profile());
 
-    // Create a fake ODFS.
-    test::CreateFakeProvidedFileSystemOneDrive(profile());
-
     // Create Drive root directory.
     {
       base::ScopedAllowBlockingForTesting allow_blocking;

chrome/browser/chrome_browser_interface_binders.cc

@@ -1654,14 +1654,14 @@ void PopulateChromeWebUIFrameBinders(
     RegisterWebUIControllerInterfaceBinder<
         ash::cloud_upload::mojom::PageHandlerFactory,
         ash::cloud_upload::CloudUploadUI>(map);
+    RegisterWebUIControllerInterfaceBinder<
+        ash::office_fallback::mojom::PageHandlerFactory,
+        ash::office_fallback::OfficeFallbackUI>(map);
   }
 
   if (ash::cloud_upload::
           IsMicrosoftOfficeOneDriveIntegrationAllowedAndOdfsInstalled(
               profile)) {
-    RegisterWebUIControllerInterfaceBinder<
-        ash::office_fallback::mojom::PageHandlerFactory,
-        ash::office_fallback::OfficeFallbackUI>(map);
     RegisterWebUIControllerInterfaceBinder<
         ash::settings::one_drive::mojom::PageHandlerFactory,
         ash::settings::OSSettingsUI>(map);