Migrate WebRTC test infra to ABSL_FLAG.

This is the last CL required to migrate WebRTC to ABSL_FLAG, rtc::Flag
will be removed soon after this one lands.

Bug: webrtc:10616
Change-Id: I2807cec39e28a2737d2c49e2dc23f2a6f98d08f0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145727
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28606}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 75ba75b..6cc9dc5 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -1593,10 +1593,10 @@
       ":neteq_test_tools",
       "../../api/audio_codecs:builtin_audio_decoder_factory",
       "../../rtc_base:checks",
-      "../../rtc_base:rtc_base_approved",
       "../../test:fileutils",
       "../../test:test_support",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -1617,7 +1617,7 @@
              "../../api/audio_codecs/ilbc:audio_encoder_ilbc",
              "../../api/audio_codecs/isac:audio_encoder_isac",
              "../../api/audio_codecs/opus:audio_encoder_opus",
-             "../../rtc_base:rtc_base_approved",
+             "../../rtc_base:safe_conversions",
            ]
 
     sources = [
@@ -1669,7 +1669,6 @@
       ":neteq",
       ":neteq_test_tools",
       ":pcm16b",
-      "../../rtc_base:rtc_base_approved",
       "//testing/gtest",
       "//third_party/abseil-cpp/absl/flags:flag",
       "//third_party/abseil-cpp/absl/flags:parse",
@@ -1691,6 +1690,7 @@
       "../../rtc_base:rtc_base_approved",
       "../../test:test_main",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -1704,8 +1704,10 @@
     deps = [
       ":neteq",
       ":neteq_test_support",
-      "../../rtc_base:rtc_base_approved",
+      "../../rtc_base:checks",
       "../../test:test_support",
+      "//third_party/abseil-cpp/absl/flags:flag",
+      "//third_party/abseil-cpp/absl/flags:parse",
     ]
   }
 
@@ -1726,6 +1728,7 @@
       "../../test:fileutils",
       "../../test:test_main",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -1743,6 +1746,7 @@
       "../../rtc_base:rtc_base_approved",
       "../../test:test_main",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -1762,6 +1766,7 @@
       "../../test:fileutils",
       "../../test:test_main",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -1781,6 +1786,7 @@
       "../../test:fileutils",
       "../../test:test_main",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
     ]
   }
 
@@ -2047,6 +2053,7 @@
       "codecs/opus/test",
       "codecs/opus/test:test_unittest",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/flags:flag",
       "//third_party/abseil-cpp/absl/memory",
       "//third_party/abseil-cpp/absl/types:optional",
     ]