GN Templates: Move common_config to the template.

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index aeb2f355584bdfc1a180cd6ce843920e85fc5eff..e7c01bef13d49732f73980d8260e00708caf94f8 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -94,7 +94,6 @@ rtc_static_library("rtc_base_approved") {
   defines = []
   libs = []
   deps = []
-  configs += [ "..:common_config" ]
   public_configs = [ "..:common_inherited_config" ]
   all_dependent_configs = [ ":rtc_base_approved_all_dependent_config" ]
 
@@ -212,7 +211,6 @@ rtc_static_library("rtc_task_queue") {
   public_deps = [
     ":rtc_base_approved",
   ]
-  configs += [ "..:common_config" ]
 
   sources = [
     "sequenced_task_checker.h",
@@ -280,7 +278,6 @@ rtc_static_library("rtc_base") {
   ]
 
   configs += [
-    "..:common_config",
     ":openssl_config",
     ":rtc_base_config",
   ]
@@ -734,10 +731,7 @@ if (rtc_include_tests) {
       "timedelta.h",
       "unittest_main.cc",
     ]
-    configs += [
-      "..:common_config",
-      ":rtc_base_tests_utils_warnings_config",
-    ]
+    configs += [ ":rtc_base_tests_utils_warnings_config" ]
     public_configs = [
       "..:common_inherited_config",
       ":rtc_base_tests_utils_exported_config",