Replace FilePath with base::FilePath in some more top level directories.

printing/printing_context_win.cc

Index: printing/printing_context_win.cc
diff --git a/printing/printing_context_win.cc b/printing/printing_context_win.cc
index 96e3572154fc9eab1cbb9fa3e4b91d277052e911..c60c7b8fd3d535725c9904afa5701b37ca8eeca9 100644
--- a/printing/printing_context_win.cc
+++ b/printing/printing_context_win.cc
@@ -460,7 +460,7 @@ PrintingContext::Result PrintingContextWin::NewDocument(
   di.lpszDocName = document_name_wide.c_str();
 
   // Is there a debug dump directory specified? If so, force to print to a file.
-  FilePath debug_dump_path = PrintedDocument::debug_dump_path();
+  base::FilePath debug_dump_path = PrintedDocument::debug_dump_path();
   if (!debug_dump_path.empty()) {
     // Create a filename.
     std::wstring filename;