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

media/tools/seek_tester/seek_tester.cc

Index: media/tools/seek_tester/seek_tester.cc
diff --git a/media/tools/seek_tester/seek_tester.cc b/media/tools/seek_tester/seek_tester.cc
index 2bed876907358f905e8985240ac4a7403658a629..0249517736a41c1de7a788e8b1909142c2698662 100644
--- a/media/tools/seek_tester/seek_tester.cc
+++ b/media/tools/seek_tester/seek_tester.cc
@@ -62,7 +62,7 @@ int main(int argc, char** argv) {
   CHECK(base::StringToUint64(argv[2], &seek_target_ms));
   scoped_refptr<media::FileDataSource> file_data_source(
       new media::FileDataSource());
-  CHECK(file_data_source->Initialize(FilePath::FromUTF8Unsafe(argv[1])));
+  CHECK(file_data_source->Initialize(base::FilePath::FromUTF8Unsafe(argv[1])));
 
   DemuxerHostImpl host;
   MessageLoop loop;