Move enable_webrtc to a buildflag header.

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index ff9bdf7ccc147d8c4b9e143bb20ab930a92fe5b5..2ceb5703c260c3c16283715eba0a09e80865fbfd 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -168,6 +168,7 @@
 #include "extensions/common/extension_set.h"
 #include "extensions/common/features/feature_channel.h"
 #include "extensions/common/manifest_handlers/shared_module_info.h"
+#include "media/media_features.h"
 #include "net/base/net_errors.h"
 #include "net/base/url_util.h"
 #include "net/http/http_stream_factory.h"
@@ -278,7 +279,7 @@ const base::FilePath::CharType kUnpackedFullscreenAppName[] =
     FILE_PATH_LITERAL("fullscreen_app");
 #endif  // !defined(OS_MACOSX)
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 // Arbitrary port range for testing the WebRTC UDP port policy.
 const char kTestWebRtcUdpPortRange[] = "10000-10100";
 #endif
@@ -3486,7 +3487,7 @@ IN_PROC_BROWSER_TEST_F(MediaRouterDisabledPolicyTest, MediaRouterDisabled) {
 }
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 // Sets the proper policy before the browser is started.
 template <bool enable>
 class WebRtcUdpPortRangePolicyTest : public PolicyTest {
@@ -3531,7 +3532,7 @@ IN_PROC_BROWSER_TEST_F(WebRtcUdpPortRangeDisabledPolicyTest,
   pref->GetValue()->GetAsString(&port_range);
   EXPECT_TRUE(port_range.empty());
 }
-#endif  // defined(ENABLE_WEBRTC)
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 // Tests the ComponentUpdater's EnabledComponentUpdates group policy by
 // calling the OnDemand interface. It uses the network interceptor to inspect