Use relative paths in GN files.

webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn

Index: webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn
diff --git a/webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn b/webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn
index 154219bf534c3676a9e30740b2225e905e44827d..2d1b1dbd3349e5b3a0237c91a5ba952ca5de5e87 100644
--- a/webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn
+++ b/webrtc/modules/audio_processing/test/py_quality_assessment/BUILD.gn
@@ -33,7 +33,7 @@ copy("scripts") {
     ":lib",
     ":output",
     "../..:audioproc_f",
-    "//resources/audio_processing/test/py_quality_assessment:probing_signals",
+    "../../../../../resources/audio_processing/test/py_quality_assessment:probing_signals",
   ]
 }
 
@@ -71,7 +71,7 @@ copy("lib") {
     "$root_build_dir/py_quality_assessment/quality_assessment/{{source_file_part}}",
   ]
   deps = [
-    "//resources/audio_processing/test/py_quality_assessment:noise_tracks",
+    "../../../../../resources/audio_processing/test/py_quality_assessment:noise_tracks",
   ]
 }
 
@@ -104,8 +104,8 @@ rtc_executable("fake_polqa") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   output_name = "py_quality_assessment/quality_assessment/fake_polqa"
   deps = [
-    "//webrtc:webrtc_common",
-    "//webrtc/base:rtc_base_approved",
+    "../../../..:webrtc_common",
+    "../../../../base:rtc_base_approved",
   ]
 }