Add FilePath to base namespace.

chrome/browser/extensions/api/messaging/native_process_launcher.h

Index: chrome/browser/extensions/api/messaging/native_process_launcher.h
diff --git a/chrome/browser/extensions/api/messaging/native_process_launcher.h b/chrome/browser/extensions/api/messaging/native_process_launcher.h
index 41e735f1f1c0a94c018db948a8739987ca7163b6..cbb9bd37fc29bc69b02905dd4f417f6a7ee34679 100644
--- a/chrome/browser/extensions/api/messaging/native_process_launcher.h
+++ b/chrome/browser/extensions/api/messaging/native_process_launcher.h
@@ -8,7 +8,9 @@
 #include "base/process.h"
 #include "chrome/browser/extensions/api/messaging/native_message_process_host.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace extensions {
 
@@ -35,7 +37,7 @@ class NativeProcessLauncher {
 
  protected:
   static bool LaunchNativeProcess(
-      const FilePath& path,
+      const base::FilePath& path,
       base::ProcessHandle* native_process_handle,
       base::PlatformFile* read_file,
       base::PlatformFile* write_file);