Extract BookmarksFileImporter from Firefox2Importer.

chrome/browser/favicon/imported_favicon_usage.cc

Index: chrome/browser/favicon/imported_favicon_usage.cc
diff --git a/content/common/font_list.cc b/chrome/browser/favicon/imported_favicon_usage.cc
similarity index 51%
copy from content/common/font_list.cc
copy to chrome/browser/favicon/imported_favicon_usage.cc
index 398ee80cf60525da22e5f6339360722920d1836c..42da2864f8e0d25d6075c832c0d4c64b26c2d7e5 100644
--- a/content/common/font_list.cc
+++ b/chrome/browser/favicon/imported_favicon_usage.cc
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/font_list.h"
+#include "chrome/browser/favicon/imported_favicon_usage.h"
 
-namespace content {
-const char kFontListSequenceToken[] = "_font_list_sequence_token_";
+ImportedFaviconUsage::ImportedFaviconUsage() {
+}
+
+ImportedFaviconUsage::~ImportedFaviconUsage() {
 }