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/rtc_tools/BUILD.gn b/rtc_tools/BUILD.gn
index 7bdda7d..6269f4c 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -183,7 +183,7 @@
       "../logging:rtc_event_log_impl_base",
       "../media:rtc_audio_video",
       "../media:rtc_media_base",
-      "../rtc_base:rtc_base",
+      "../rtc_base",
       "../rtc_base:rtc_base_approved",
       "../rtc_base:rtc_json",
       "../rtc_base/system:file_wrapper",
@@ -418,7 +418,7 @@
       "../api:scoped_refptr",
       "../api/video:video_frame",
       "../api/video:video_frame_i420",
-      "../common_video:common_video",
+      "../common_video",
       "../rtc_base",
       "../rtc_base:checks",
       "../test:fileutils",