Add explicit base to FilePath.

ppapi/shared_impl/file_path.h

Index: ppapi/shared_impl/file_path.h
diff --git a/ppapi/shared_impl/file_path.h b/ppapi/shared_impl/file_path.h
index 3d850f97fc7d8111f8f3197b587628875a230300..ff475496dc39d96a89994c13b15c67f1a694945f 100644
--- a/ppapi/shared_impl/file_path.h
+++ b/ppapi/shared_impl/file_path.h
@@ -26,14 +26,14 @@ class PPAPI_SHARED_EXPORT PepperFilePath {
   };
 
   PepperFilePath();
-  PepperFilePath(Domain d, const FilePath& p);
+  PepperFilePath(Domain d, const base::FilePath& p);
 
   Domain domain() const { return domain_; }
-  const FilePath& path() const { return path_; }
+  const base::FilePath& path() const { return path_; }
 
  private:
   Domain domain_;
-  FilePath path_;
+  base::FilePath path_;
 };
 
 }  // namespace ppapi