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

media/audio/audio_low_latency_input_output_unittest.cc

Index: media/audio/audio_low_latency_input_output_unittest.cc
diff --git a/media/audio/audio_low_latency_input_output_unittest.cc b/media/audio/audio_low_latency_input_output_unittest.cc
index 463321a22b0df40d104ffd2581d6d384d3955520..713ccc47c12f527730b74675dc12524074a096dd 100644
--- a/media/audio/audio_low_latency_input_output_unittest.cc
+++ b/media/audio/audio_low_latency_input_output_unittest.cc
@@ -154,7 +154,7 @@ class FullDuplexAudioSinkSource
   virtual ~FullDuplexAudioSinkSource() {
     // Get complete file path to output file in the directory containing
     // media_unittests.exe. Example: src/build/Debug/audio_delay_values_ms.txt.
-    FilePath file_name;
+    base::FilePath file_name;
     EXPECT_TRUE(PathService::Get(base::DIR_EXE, &file_name));
     file_name = file_name.AppendASCII(kDelayValuesFileName);