Add explicit base to FilePath.

content/shell/shell_message_filter.cc

Index: content/shell/shell_message_filter.cc
diff --git a/content/shell/shell_message_filter.cc b/content/shell/shell_message_filter.cc
index 4450a7d7916d353fb04d8f96cf3051e43915c3c9..e9d344578829cb9c5ac7ef2e4ee40f5106baa5ef 100644
--- a/content/shell/shell_message_filter.cc
+++ b/content/shell/shell_message_filter.cc
@@ -31,13 +31,13 @@ bool ShellMessageFilter::OnMessageReceived(const IPC::Message& message,
   return handled;
 }
 
-void ShellMessageFilter::OnReadFileToString(const FilePath& local_file,
+void ShellMessageFilter::OnReadFileToString(const base::FilePath& local_file,
                                             std::string* contents) {
   file_util::ReadFileToString(local_file, contents);
 }
 
 void ShellMessageFilter::OnRegisterIsolatedFileSystem(
-    const std::vector<FilePath>& absolute_filenames,
+    const std::vector<base::FilePath>& absolute_filenames,
     std::string* filesystem_id) {
   fileapi::IsolatedContext::FileInfoSet files;
   ChildProcessSecurityPolicy* policy =