Replace FilePath with base::FilePath in some more top level directories.

ui/shell_dialogs/gtk/select_file_dialog_impl.cc

Index: ui/shell_dialogs/gtk/select_file_dialog_impl.cc
diff --git a/ui/shell_dialogs/gtk/select_file_dialog_impl.cc b/ui/shell_dialogs/gtk/select_file_dialog_impl.cc
index d560af924c20c48afeaca55a06eb4bb4ea36d317..05f51131ab2cdc4c85798bc0c74b682f70b46347 100644
--- a/ui/shell_dialogs/gtk/select_file_dialog_impl.cc
+++ b/ui/shell_dialogs/gtk/select_file_dialog_impl.cc
@@ -68,8 +68,8 @@ SelectFileDialogImpl::SelectFileDialogImpl(Listener* listener,
       file_type_index_(0),
       type_(SELECT_NONE) {
   if (!last_saved_path_) {
-    last_saved_path_ = new FilePath();
-    last_opened_path_ = new FilePath();
+    last_saved_path_ = new base::FilePath();
+    last_opened_path_ = new base::FilePath();
   }
 }
 
@@ -83,7 +83,8 @@ bool SelectFileDialogImpl::IsRunning(gfx::NativeWindow parent_window) const {
   return parents_.find(parent_window) != parents_.end();
 }
 
-bool SelectFileDialogImpl::CallDirectoryExistsOnUIThread(const FilePath& path) {
+bool SelectFileDialogImpl::CallDirectoryExistsOnUIThread(
+    const base::FilePath& path) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   return file_util::DirectoryExists(path);
 }