Bug 1890926 - Remove unused temporary variable. r=hiro

Differential Revision: https://phabricator.services.mozilla.com/D207236

layout/base/PresShell.cpp

@@ -11260,10 +11260,8 @@ void PresShell::SetIsActive(bool aIsActive) {
 #if defined(MOZ_WIDGET_ANDROID)
     if (!aIsActive && presContext &&
         presContext->IsRootContentDocumentCrossProcess()) {
-      if (BrowserChild* browserChild = BrowserChild::GetFrom(this)) {
-        // Reset the dynamic toolbar offset state.
-        presContext->UpdateDynamicToolbarOffset(0);
-      }
+      // Reset the dynamic toolbar offset state.
+      presContext->UpdateDynamicToolbarOffset(0);
     }
 #endif
   }