move SafariImporter::CanImport to common

chrome/common/importer/safari_importer_utils.mm

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/common/importer/safari_importer_utils.h"
+
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "chrome/common/importer/importer_data_types.h"
+
+bool SafariImporterCanImport(const base::FilePath& library_dir,
+                             uint16* services_supported) {
+  DCHECK(services_supported);
+  *services_supported = importer::NONE;
+
+  // Import features are toggled by the following:
+  // bookmarks import: existence of ~/Library/Safari/Bookmarks.plist file.
+  // history import: existence of ~/Library/Safari/History.plist file.
+  base::FilePath safari_dir = library_dir.Append("Safari");
+  base::FilePath bookmarks_path = safari_dir.Append("Bookmarks.plist");
+  base::FilePath history_path = safari_dir.Append("History.plist");
+
+  if (base::PathExists(bookmarks_path))
+    *services_supported |= importer::FAVORITES;
+  if (base::PathExists(history_path))
+    *services_supported |= importer::HISTORY;
+
+  return *services_supported != importer::NONE;
+}