Add FilePath to base namespace.

remoting/host/linux/audio_pipe_reader.h

Index: remoting/host/linux/audio_pipe_reader.h
diff --git a/remoting/host/linux/audio_pipe_reader.h b/remoting/host/linux/audio_pipe_reader.h
index b0c56e752916282dd9564ad135b8e98209f2e4a4..a373ac3a4e0f4577f2685175a185bb5be0a5f4e4 100644
--- a/remoting/host/linux/audio_pipe_reader.h
+++ b/remoting/host/linux/audio_pipe_reader.h
@@ -12,7 +12,9 @@
 #include "base/time.h"
 #include "base/timer.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace remoting {
 
@@ -33,7 +35,7 @@ class AudioPipeReader
   // |task_runner| specifies the IO thread to use to read data from the pipe.
   static scoped_refptr<AudioPipeReader> Create(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      const FilePath& pipe_name);
+      const base::FilePath& pipe_name);
 
   // Register or unregister an observer. Each observer receives data on the
   // thread on which it was registered and guaranteed not to be called after
@@ -53,7 +55,7 @@ class AudioPipeReader
   AudioPipeReader(scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   virtual ~AudioPipeReader();
 
-  void StartOnAudioThread(const FilePath& pipe_name);
+  void StartOnAudioThread(const base::FilePath& pipe_name);
   void StartTimer();
   void DoCapture();
   void WaitForPipeReadable();