Remove .bind(this) pattern in terminal

Fixes #15719

src/vs/workbench/parts/terminal/electron-browser/terminalPanel.ts

@@ -62,8 +62,8 @@ export class TerminalPanel extends Panel {
 
 		this._terminalService.setContainers(this.getContainer().getHTMLElement(), this._terminalContainer);
 
-		this._register(this._themeService.onDidColorThemeChange(this._updateTheme.bind(this)));
-		this._register(this._configurationService.onDidUpdateConfiguration(this._updateFont.bind(this)));
+		this._register(this._themeService.onDidColorThemeChange(themeId => this._updateTheme(themeId)));
+		this._register(this._configurationService.onDidUpdateConfiguration(() => this._updateFont()));
 		this._updateFont();
 		this._updateTheme();
 

src/vs/workbench/parts/terminal/electron-browser/terminalService.ts

@@ -56,7 +56,7 @@ export class TerminalService implements ITerminalService {
 		this._onInstanceTitleChanged = new Emitter<string>();
 		this._onInstancesChanged = new Emitter<string>();
 
-		this._configurationService.onDidUpdateConfiguration(this.updateConfig.bind(this));
+		this._configurationService.onDidUpdateConfiguration(() => this.updateConfig());
 		this._terminalFocusContextKey = KEYBINDING_CONTEXT_TERMINAL_FOCUS.bindTo(this._contextKeyService);
 		this._configHelper = <TerminalConfigHelper>this._instantiationService.createInstance(TerminalConfigHelper, platform.platform);
 		this.onInstanceDisposed((terminalInstance) => { this._removeInstance(terminalInstance); });