Move quic_flags.h from net/quic/core to net/quic/platform and split into api and impl.

net/quic/core/quic_versions_test.cc

Index: net/quic/core/quic_versions_test.cc
diff --git a/net/quic/core/quic_versions_test.cc b/net/quic/core/quic_versions_test.cc
index a87f225f6fab8a041b82a2a32fa9f7748c30bed8..0b392a9e5b2a445695f4e409810639d382bc90c6 100644
--- a/net/quic/core/quic_versions_test.cc
+++ b/net/quic/core/quic_versions_test.cc
@@ -4,8 +4,9 @@
 
 #include "net/quic/core/quic_versions.h"
 
-#include "net/quic/core/quic_flags.h"
+#include "net/quic/platform/api/quic_flags.h"
 #include "net/quic/test_tools/quic_test_utils.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
@@ -146,7 +147,7 @@ TEST(QuicVersionsTest, FilterSupportedVersionsNo39) {
                                     QUIC_VERSION_39};
 
   FLAGS_quic_reloadable_flag_quic_enable_version_38 = true;
-  base::SetFlag(&FLAGS_quic_enable_version_39, false);
+  SetQuicFlag(&FLAGS_quic_enable_version_39, false);
 
   QuicVersionVector filtered_versions = FilterSupportedVersions(all_versions);
   ASSERT_EQ(4u, filtered_versions.size());
@@ -163,7 +164,7 @@ TEST(QuicVersionsTest, FilterSupportedVersionsAllVersions) {
                                     QUIC_VERSION_39};
 
   FLAGS_quic_reloadable_flag_quic_enable_version_38 = true;
-  base::SetFlag(&FLAGS_quic_enable_version_39, true);
+  SetQuicFlag(&FLAGS_quic_enable_version_39, true);
 
   QuicVersionVector filtered_versions = FilterSupportedVersions(all_versions);
   ASSERT_EQ(all_versions, filtered_versions);