Always use arc::InstanceHolder<T>::GetInstanceForMethod

components/arc/crash_collector/arc_crash_collector_bridge.cc

Index: components/arc/crash_collector/arc_crash_collector_bridge.cc
diff --git a/components/arc/crash_collector/arc_crash_collector_bridge.cc b/components/arc/crash_collector/arc_crash_collector_bridge.cc
index 8557308a6b87703c0994a97aa5dbbffd3c395439..223e8f353a38d9d1dc27a2c2dba58363ca851ae6 100644
--- a/components/arc/crash_collector/arc_crash_collector_bridge.cc
+++ b/components/arc/crash_collector/arc_crash_collector_bridge.cc
@@ -31,8 +31,11 @@ ArcCrashCollectorBridge::~ArcCrashCollectorBridge() {
 void ArcCrashCollectorBridge::OnInstanceReady() {
   mojom::CrashCollectorHostPtr host_ptr;
   binding_.Bind(mojo::GetProxy(&host_ptr));
-  arc_bridge_service()->crash_collector()->instance()->Init(
-      std::move(host_ptr));
+  auto* instance =
+      arc_bridge_service()->crash_collector()->GetInstanceForMethod("Init");
+  if (!instance)
+    return;
+  instance->Init(std::move(host_ptr));
 }
 
 void ArcCrashCollectorBridge::DumpCrash(const mojo::String& type,