Move enable_webrtc to a buildflag header.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 7f479a7012f1b1c05c6f6e1003bdf67b5fa38c34..e0a6a57da6e74be154f0b8d19775a05e8ee2a4d3 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -179,6 +179,7 @@
 #include "device/usb/public/interfaces/device_manager.mojom.h"
 #include "extensions/features/features.h"
 #include "gin/v8_initializer.h"
+#include "media/media_features.h"
 #include "net/base/mime_util.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/cookies/canonical_cookie.h"
@@ -329,7 +330,7 @@
 #include "components/spellcheck/browser/spellcheck_message_filter_platform.h"
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 #include "chrome/browser/media/audio_debug_recordings_handler.h"
 #include "chrome/browser/media/webrtc/webrtc_logging_handler_host.h"
 #endif
@@ -1049,7 +1050,7 @@ void ChromeContentBrowserClient::RenderProcessWillLaunch(
   host->AddFilter(new ChromeNetBenchmarkingMessageFilter(profile, context));
   host->AddFilter(new prerender::PrerenderMessageFilter(id, profile));
   host->AddFilter(new TtsMessageFilter(host->GetBrowserContext()));
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   WebRtcLoggingHandlerHost* webrtc_logging_handler_host =
       new WebRtcLoggingHandlerHost(id, profile,
                                    g_browser_process->webrtc_log_uploader());
@@ -1606,7 +1607,7 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
           chromeos::switches::kLoginProfile, login_profile);
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
     MaybeCopyDisableWebRtcEncryptionSwitch(command_line,
                                            browser_command_line,
                                            chrome::GetChannel());
@@ -2071,7 +2072,7 @@ bool ChromeContentBrowserClient::AllowWorkerIndexedDB(
   return allow;
 }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 bool ChromeContentBrowserClient::AllowWebRTCIdentityCache(
     const GURL& url,
     const GURL& first_party_url,
@@ -2083,7 +2084,7 @@ bool ChromeContentBrowserClient::AllowWebRTCIdentityCache(
   return cookie_settings->IsReadingCookieAllowed(url, first_party_url) &&
          cookie_settings->IsSettingCookieAllowed(url, first_party_url);
 }
-#endif  // defined(ENABLE_WEBRTC)
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 bool ChromeContentBrowserClient::AllowKeygen(
     const GURL& url,
@@ -3259,7 +3260,7 @@ void ChromeContentBrowserClient::OverridePageVisibilityState(
   }
 }
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 void ChromeContentBrowserClient::MaybeCopyDisableWebRtcEncryptionSwitch(
     base::CommandLine* to_command_line,
     const base::CommandLine& from_command_line,
@@ -3280,7 +3281,7 @@ void ChromeContentBrowserClient::MaybeCopyDisableWebRtcEncryptionSwitch(
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
-#endif  // defined(ENABLE_WEBRTC)
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 std::unique_ptr<content::MemoryCoordinatorDelegate>
 ChromeContentBrowserClient::GetMemoryCoordinatorDelegate() {