Permissions: Avoid poking at the heap after Blink shutdown

third_party/WebKit/Source/modules/permissions/Permissions.cpp

Index: third_party/WebKit/Source/modules/permissions/Permissions.cpp
diff --git a/third_party/WebKit/Source/modules/permissions/Permissions.cpp b/third_party/WebKit/Source/modules/permissions/Permissions.cpp
index b3117794d08b21d18c6df9235b5f34eda1994b70..cebf9b8a670f6e3014121392f91c0f145a61aca3 100644
--- a/third_party/WebKit/Source/modules/permissions/Permissions.cpp
+++ b/third_party/WebKit/Source/modules/permissions/Permissions.cpp
@@ -264,6 +264,13 @@ PermissionService* Permissions::getService(ExecutionContext* executionContext) {
 }
 
 void Permissions::serviceConnectionError() {
+  if (!Platform::current()) {
+    // TODO(rockot): Remove this hack once renderer shutdown sequence is fixed.
+    // Note that reaching this code indicates that the MessageLoop has already
+    // been torn down, so it's impossible for any pending reply callbacks on
+    // |m_service| to fire beyond this point anyway.
+    return;
+  }
   m_service.reset();
 }