Add FilePath to base namespace.

chrome/test/logging/win/file_logger.h

Index: chrome/test/logging/win/file_logger.h
diff --git a/chrome/test/logging/win/file_logger.h b/chrome/test/logging/win/file_logger.h
index d09b68235b4f3ccc371171d63397e31992030d3e..5a6caa6da7a0fcbb03c19b1e717f47ba12071e4d 100644
--- a/chrome/test/logging/win/file_logger.h
+++ b/chrome/test/logging/win/file_logger.h
@@ -11,7 +11,9 @@
 #include "base/string16.h"
 #include "base/win/event_trace_controller.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace logging_win {
 
@@ -59,7 +61,7 @@ class FileLogger {
   // extension for such files is .etl.  Returns false if the session could not
   // be started (e.g., if not running as admin) or if no providers could be
   // enabled.
-  bool StartLogging(const FilePath& log_file);
+  bool StartLogging(const base::FilePath& log_file);
 
   // Stops capturing logs.
   void StopLogging();