Cleanup BUILD.gn files from imports like foo:foo

Repalce all occurrences of foo:foo in deps with just foo in BUILD.gn
files.

Done with Sublime regex replace.
Find: \b([-a-zA-Z0-9_]+):+\1\b
In: *.gn
Replace with: \1

Bug: None
Change-Id: I40aba1b14face687a595b852ffe443cb20197611
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127899
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27225}
diff --git a/modules/audio_coding/codecs/opus/test/BUILD.gn b/modules/audio_coding/codecs/opus/test/BUILD.gn
index 058dbfa..51b0df3 100644
--- a/modules/audio_coding/codecs/opus/test/BUILD.gn
+++ b/modules/audio_coding/codecs/opus/test/BUILD.gn
@@ -27,7 +27,7 @@
     ]
 
     deps = [
-      "../../../../../common_audio:common_audio",
+      "../../../../../common_audio",
       "../../../../../common_audio:common_audio_c",
       "../../../../../rtc_base:checks",
       "../../../../../rtc_base/memory:aligned_array",
@@ -45,7 +45,7 @@
 
     deps = [
       ":test",
-      "../../../../../common_audio:common_audio",
+      "../../../../../common_audio",
       "../../../../../common_audio:common_audio_c",
       "../../../../../rtc_base:rtc_base_approved",
       "../../../../../test:test_support",