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_base/BUILD.gn b/rtc_base/BUILD.gn
index c5531bf..f4e9f76 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -252,7 +252,7 @@
 
   if (build_with_chromium) {
     # Dependency on chromium's waitable_event (in //base).
-    deps += [ "//base:base" ]
+    deps += [ "//base" ]
     sources = [
       "../../webrtc_overrides/rtc_base/event.cc",
       "../../webrtc_overrides/rtc_base/event.h",
@@ -281,7 +281,7 @@
 
   if (build_with_chromium) {
     # Dependency on chromium's logging (in //base).
-    deps += [ "//base:base" ]
+    deps += [ "//base" ]
     sources = [
       "../../webrtc_overrides/rtc_base/logging.cc",
       "../../webrtc_overrides/rtc_base/logging.h",
@@ -433,7 +433,7 @@
     ":macromagic",
     ":safe_minmax",
     "../api:array_view",
-    "//third_party/abseil-cpp/absl/strings:strings",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -1181,10 +1181,10 @@
       ":rtc_base_tests_main",
       ":rtc_base_tests_utils",
       ":testclient",
-      "../system_wrappers:system_wrappers",
+      "../system_wrappers",
       "../test:fileutils",
       "../test:test_support",
-      "third_party/sigslot:sigslot",
+      "third_party/sigslot",
       "//testing/gtest",
       "//third_party/abseil-cpp/absl/memory",
     ]
@@ -1259,12 +1259,12 @@
       "../api:array_view",
       "../api:scoped_refptr",
       "../api/units:time_delta",
-      "../system_wrappers:system_wrappers",
+      "../system_wrappers",
       "../test:fileutils",
       "../test:test_support",
       "memory:unittests",
       "third_party/base64",
-      "third_party/sigslot:sigslot",
+      "third_party/sigslot",
       "//third_party/abseil-cpp/absl/memory",
     ]
   }