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

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

Index: webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
index 8506e326cb48cd15410cd5c950cf5348f1523afd..5a73a6adb1a6978488e72011869846343a0df40d 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
@@ -10,9 +10,8 @@
 
 #include "webrtc/modules/audio_coding/codecs/isac/fix/include/isacfix.h"
 #include "webrtc/modules/audio_coding/neteq/tools/neteq_quality_test.h"
+#include "webrtc/rtc_base/flags.h"
 
-using google::RegisterFlagValidator;
-using google::ParseCommandLineFlags;
 using testing::InitGoogleTest;
 
 namespace webrtc {
@@ -22,18 +21,7 @@ static const int kIsacBlockDurationMs = 30;
 static const int kIsacInputSamplingKhz = 16;
 static const int kIsacOutputSamplingKhz = 16;
 
-// Define switch for bit rate.
-static bool ValidateBitRate(const char* flagname, int32_t value) {
-  if (value >= 10 && value <= 32)
-    return true;
-  printf("Invalid bit rate, should be between 10 and 32 kbps.");
-  return false;
-}
-
-DEFINE_int32(bit_rate_kbps, 32, "Target bit rate (kbps).");
-
-static const bool bit_rate_dummy =
-    RegisterFlagValidator(&FLAGS_bit_rate_kbps, &ValidateBitRate);
+DEFINE_int(bit_rate_kbps, 32, "Target bit rate (kbps).");
 
 }  // namespace
 
@@ -55,7 +43,11 @@ NetEqIsacQualityTest::NetEqIsacQualityTest()
                        kIsacOutputSamplingKhz,
                        NetEqDecoder::kDecoderISAC),
       isac_encoder_(NULL),
-      bit_rate_kbps_(FLAGS_bit_rate_kbps) {}
+      bit_rate_kbps_(FLAG_bit_rate_kbps) {
+    // Flag validation
+    RTC_CHECK(FLAG_bit_rate_kbps >= 10 && FLAG_bit_rate_kbps <= 32)
+        << "Invalid bit rate, should be between 10 and 32 kbps.";
+  }
 
 void NetEqIsacQualityTest::SetUp() {
   ASSERT_EQ(1u, channels_) << "iSAC supports only mono audio.";