Add FilePath to base namespace.

net/base/upload_data.h

Index: net/base/upload_data.h
diff --git a/net/base/upload_data.h b/net/base/upload_data.h
index 4e6c6ca3c413e425dc9373199efd6bba877bd85d..b782ab4e4ded7e87b21e484e111dc2e794f2fbe5 100644
--- a/net/base/upload_data.h
+++ b/net/base/upload_data.h
@@ -12,9 +12,8 @@
 #include "net/base/net_export.h"
 #include "net/base/upload_element.h"
 
-class FilePath;
-
 namespace base {
+class FilePath;
 class Time;
 }  // namespace base
 
@@ -35,7 +34,7 @@ class NET_EXPORT UploadData
 
   void AppendBytes(const char* bytes, int bytes_len);
 
-  void AppendFileRange(const FilePath& file_path,
+  void AppendFileRange(const base::FilePath& file_path,
                        uint64 offset, uint64 length,
                        const base::Time& expected_modification_time);