Move FilePathWatcher to base/files.

base/files/file_path_watcher.cc

Index: base/files/file_path_watcher.cc
diff --git a/content/common/file_path_watcher/file_path_watcher.cc b/base/files/file_path_watcher.cc
similarity index 85%
rename from content/common/file_path_watcher/file_path_watcher.cc
rename to base/files/file_path_watcher.cc
index 41f3e2b10a98ef490a0edc75691e407b9f244a49..7ce64ac49cf1df6eac1bbfdcda45cb71b4e92195 100644
--- a/content/common/file_path_watcher/file_path_watcher.cc
+++ b/base/files/file_path_watcher.cc
@@ -5,11 +5,14 @@
 // Cross platform methods for FilePathWatcher. See the various platform
 // specific implementation files, too.
 
-#include "content/common/file_path_watcher/file_path_watcher.h"
+#include "base/files/file_path_watcher.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 
+namespace base {
+namespace files {
+
 FilePathWatcher::~FilePathWatcher() {
   impl_->Cancel();
 }
@@ -26,3 +29,5 @@ FilePathWatcher::PlatformDelegate::~PlatformDelegate() {
   DCHECK(is_cancelled());
 }
 
+}  // namespace files
+}  // namespace base