Replace gflags usages with rtc_base/flags in all targets based on test_main

webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc

Index: webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc
index 4e5f1592cb26a1f75430de084349d2647b13cb87..2f8ca1b78f0ea9bb0dd0c821c7704400835e4ba0 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_ilbc_quality_test.cc
@@ -13,11 +13,10 @@
 #include "webrtc/modules/audio_coding/codecs/ilbc/audio_encoder_ilbc.h"
 #include "webrtc/modules/audio_coding/neteq/tools/neteq_quality_test.h"
 #include "webrtc/rtc_base/checks.h"
+#include "webrtc/rtc_base/flags.h"
 #include "webrtc/rtc_base/safe_conversions.h"
 #include "webrtc/test/testsupport/fileutils.h"
 
-using google::RegisterFlagValidator;
-using google::ParseCommandLineFlags;
 using testing::InitGoogleTest;
 
 namespace webrtc {
@@ -26,33 +25,27 @@ namespace {
 static const int kInputSampleRateKhz = 8;
 static const int kOutputSampleRateKhz = 8;
 
-// Define switch for frame size.
-static bool ValidateFrameSize(const char* flagname, int32_t value) {
-  if (value == 20 || value == 30 || value == 40 || value == 60)
-    return true;
-  printf("Invalid frame size, should be 20, 30, 40, or 60 ms.");
-  return false;
-}
-
-DEFINE_int32(frame_size_ms, 20, "Codec frame size (milliseconds).");
-
-static const bool frame_size_dummy =
-    RegisterFlagValidator(&FLAGS_frame_size_ms, &ValidateFrameSize);
+DEFINE_int(frame_size_ms, 20, "Codec frame size (milliseconds).");
 
 }  // namespace
 
 class NetEqIlbcQualityTest : public NetEqQualityTest {
  protected:
   NetEqIlbcQualityTest()
-      : NetEqQualityTest(FLAGS_frame_size_ms,
+      : NetEqQualityTest(FLAG_frame_size_ms,
                          kInputSampleRateKhz,
                          kOutputSampleRateKhz,
-                         NetEqDecoder::kDecoderILBC) {}
+                         NetEqDecoder::kDecoderILBC) {
+    // Flag validation
+    RTC_CHECK(FLAG_frame_size_ms == 20 || FLAG_frame_size_ms == 30 ||
+              FLAG_frame_size_ms == 40 || FLAG_frame_size_ms == 60)
+        << "Invalid frame size, should be 20, 30, 40, or 60 ms.";
+  }
 
   void SetUp() override {
     ASSERT_EQ(1u, channels_) << "iLBC supports only mono audio.";
     AudioEncoderIlbcConfig config;
-    config.frame_size_ms = FLAGS_frame_size_ms;
+    config.frame_size_ms = FLAG_frame_size_ms;
     encoder_.reset(new AudioEncoderIlbcImpl(config, 102));
     NetEqQualityTest::SetUp();
   }