Add FilePath to base namespace.

remoting/host/json_host_config.h

Index: remoting/host/json_host_config.h
diff --git a/remoting/host/json_host_config.h b/remoting/host/json_host_config.h
index c0148cca32af3ccacb359ccbbddf43a518eb81bb..c8a4abab896623ed6e06d290b446650ebfda4500 100644
--- a/remoting/host/json_host_config.h
+++ b/remoting/host/json_host_config.h
@@ -19,7 +19,7 @@ namespace remoting {
 // JsonHostConfig implements MutableHostConfig for JSON file.
 class JsonHostConfig : public InMemoryHostConfig {
  public:
-  JsonHostConfig(const FilePath& filename);
+  JsonHostConfig(const base::FilePath& filename);
   virtual ~JsonHostConfig();
 
   virtual bool Read();
@@ -34,7 +34,7 @@ class JsonHostConfig : public InMemoryHostConfig {
   bool SetSerializedData(const std::string& config);
 
  private:
-  FilePath filename_;
+  base::FilePath filename_;
 
   DISALLOW_COPY_AND_ASSIGN(JsonHostConfig);
 };