Add FilePath to base namespace.

chrome_frame/chrome_launcher_utils.h

Index: chrome_frame/chrome_launcher_utils.h
diff --git a/chrome_frame/chrome_launcher_utils.h b/chrome_frame/chrome_launcher_utils.h
index a4b79e93cb57edb4568f17cc876f0ab6bb7b626f..d13f4b06497934cac220ab85c1225e5a6d765a4b 100644
--- a/chrome_frame/chrome_launcher_utils.h
+++ b/chrome_frame/chrome_launcher_utils.h
@@ -9,7 +9,10 @@
 #include "base/memory/scoped_ptr.h"
 
 class CommandLine;
+
+namespace base {
 class FilePath;
+}
 
 namespace chrome_launcher {
 
@@ -35,7 +38,7 @@ bool CreateUpdateCommandLine(const std::wstring& update_command,
                              scoped_ptr<CommandLine>* command_line);
 
 // Returns the full path to the Chrome executable.
-FilePath GetChromeExecutablePath();
+base::FilePath GetChromeExecutablePath();
 
 }  // namespace chrome_launcher