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

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

Index: webrtc/modules/audio_coding/neteq/test/neteq_pcmu_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_pcmu_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_pcmu_quality_test.cc
index eb75fda029260af5bb2d89211981e06373518785..5ea90569a558c11f70109a0798ebfb90d7c91c8d 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_pcmu_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_pcmu_quality_test.cc
@@ -13,11 +13,10 @@
 #include "webrtc/modules/audio_coding/codecs/g711/audio_encoder_pcm.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 >= 10 && value <= 60 && (value % 10) == 0)
-    return true;
-  printf("Invalid frame size, should be 10, 20, ..., 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 NetEqPcmuQualityTest : public NetEqQualityTest {
  protected:
   NetEqPcmuQualityTest()
-      : NetEqQualityTest(FLAGS_frame_size_ms,
+      : NetEqQualityTest(FLAG_frame_size_ms,
                          kInputSampleRateKhz,
                          kOutputSampleRateKhz,
-                         NetEqDecoder::kDecoderPCMu) {}
+                         NetEqDecoder::kDecoderPCMu) {
+    // Flag validation
+    RTC_CHECK(FLAG_frame_size_ms >= 10 && FLAG_frame_size_ms <= 60 &&
+              (FLAG_frame_size_ms % 10) == 0)
+        << "Invalid frame size, should be 10, 20, ..., 60 ms.";
+  }
 
   void SetUp() override {
     ASSERT_EQ(1u, channels_) << "PCMu supports only mono audio.";
     AudioEncoderPcmU::Config config;
-    config.frame_size_ms = FLAGS_frame_size_ms;
+    config.frame_size_ms = FLAG_frame_size_ms;
     encoder_.reset(new AudioEncoderPcmU(config));
     NetEqQualityTest::SetUp();
   }