Move AudioDebugFileWriter from content/ to media/.

media/audio/BUILD.gn

Index: media/audio/BUILD.gn
diff --git a/media/audio/BUILD.gn b/media/audio/BUILD.gn
index f371888a98c7cdddd0f28e6d6d5e696fd54474d8..a77d84bc3239c7f257ddeb916a7f50e8fcef78da 100644
--- a/media/audio/BUILD.gn
+++ b/media/audio/BUILD.gn
@@ -54,6 +54,8 @@ source_set("audio") {
   visibility = [ "//media/*" ]
   sources = [
     "agc_audio_stream.h",
+    "audio_debug_file_writer.cc",
+    "audio_debug_file_writer.h",
     "audio_device_description.cc",
     "audio_device_description.h",
     "audio_device_name.cc",
@@ -62,7 +64,6 @@ source_set("audio") {
     "audio_device_thread.h",
     "audio_features.cc",
     "audio_features.h",
-    "audio_file_writer.h",
     "audio_input_controller.cc",
     "audio_input_controller.h",
     "audio_input_device.cc",
@@ -302,6 +303,7 @@ static_library("test_support") {
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "audio_debug_file_writer_unittest.cc",
     "audio_input_controller_unittest.cc",
     "audio_input_device_unittest.cc",
     "audio_input_unittest.cc",