Fix linker warning in broadcast_channel.mojom-blink.obj.

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 62a813f485ddace8c1947222d49d262ba616155a..5df9063c102dc30611ffca5081bd94b98ae8af59 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -97,7 +97,6 @@ class WebNotificationManager;
 class WebPluginListBuilder;
 class WebPrescientNetworking;
 class WebProcessMemoryDump;
-class WebPublicSuffixList;
 class WebPushProvider;
 class WebRTCCertificateGenerator;
 class WebRTCPeerConnectionHandler;
@@ -331,12 +330,6 @@ public:
     virtual void getPluginList(bool refresh, WebPluginListBuilder*) { }
 
 
-    // Public Suffix List --------------------------------------------------
-
-    // May return null on some platforms.
-    virtual WebPublicSuffixList* publicSuffixList() { return nullptr; }
-
-
     // Resources -----------------------------------------------------------
 
     // Returns a localized string resource (with substitution parameters).