Update to Chromium version 85.0.4183.0 (#782793)

- Windows: 10.0.19041 SDK is now required.
- macOS: 10.15.1 SDK (at least Xcode 11.2) is now required.
- Remove CefMediaSource::IsValid and CefMediaSink::IsValid which would
  always return true.

libcef/browser/extensions/extension_system.h

@@ -17,12 +17,9 @@
 #include "base/one_shot_event.h"
 #include "extensions/browser/extension_system.h"
 
-class BrowserContextKeyedServiceFactory;
-
 namespace base {
 class DictionaryValue;
-class FilePath;
-}  // namespace base
+}
 
 namespace content {
 class BrowserContext;
@@ -31,11 +28,8 @@ class BrowserContext;
 namespace extensions {
 
 class ExtensionRegistry;
-class InfoMap;
 class ProcessManager;
 class RendererStartupHelper;
-class SharedUserScriptMaster;
-class ValueStoreFactory;
 
 // Used to manage extensions.
 class CefExtensionSystem : public ExtensionSystem {
@@ -93,7 +87,7 @@ class CefExtensionSystem : public ExtensionSystem {
   RuntimeData* runtime_data() override;
   ManagementPolicy* management_policy() override;
   ServiceWorkerManager* service_worker_manager() override;
-  SharedUserScriptMaster* shared_user_script_master() override;
+  SharedUserScriptManager* shared_user_script_manager() override;
   StateStore* state_store() override;
   StateStore* rules_store() override;
   scoped_refptr<ValueStoreFactory> store_factory() override;
@@ -107,6 +101,7 @@ class CefExtensionSystem : public ExtensionSystem {
       const std::string& extension_id,
       const UnloadedExtensionReason reason) override;
   const base::OneShotEvent& ready() const override;
+  bool is_ready() const override;
   ContentVerifier* content_verifier() override;
   std::unique_ptr<ExtensionSet> GetDependentExtensions(
       const Extension* extension) override;