Move FilePathWatcher to base/files.

base/files/file_path_watcher_mac.cc

Index: base/files/file_path_watcher_mac.cc
diff --git a/content/common/file_path_watcher/file_path_watcher_mac.cc b/base/files/file_path_watcher_mac.cc
similarity index 99%
rename from content/common/file_path_watcher/file_path_watcher_mac.cc
rename to base/files/file_path_watcher_mac.cc
index eb72b9428885e24225dde2c4b7c111449b353704..0ef30e02b2771415dbc181c39b33e0399870f60c 100644
--- a/content/common/file_path_watcher/file_path_watcher_mac.cc
+++ b/base/files/file_path_watcher_mac.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/common/file_path_watcher/file_path_watcher.h"
+#include "base/files/file_path_watcher.h"
 
 #include <fcntl.h>
 #include <sys/event.h>
@@ -15,6 +15,8 @@
 #include "base/message_loop_proxy.h"
 #include "base/stringprintf.h"
 
+using ::base::files::FilePathWatcher;
+
 namespace {
 
 // Mac-specific file watcher implementation based on kqueue.