ArcSelectFilesHandler: Pass request->search_query to SelectFileDialog

Bug: 1126742
Test: atest DocumentsTest#testGetContentWithQuery_matchingFileShowing
Change-Id: I4f19e235521056e6a6745f2d2974883fc746e691
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491840
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820674}

chrome/browser/chromeos/arc/fileapi/arc_select_files_handler.cc

@@ -400,9 +400,7 @@ bool SelectFileDialogHolder::SelectFile(
       type,
       /*title=*/base::string16(), default_path, file_types,
       /*file_type_index=*/0,
-      /*params=*/nullptr, owner,
-      /*search_query=*/"",  // TODO(niwa): Pass request->search_query.
-      show_android_picker_apps);
+      /*params=*/nullptr, owner, search_query, show_android_picker_apps);
   return true;
 }