Do not SendPasswordForms when LocalFrame is being detached

third_party/WebKit/Source/core/frame/LocalFrame.h

Index: third_party/WebKit/Source/core/frame/LocalFrame.h
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.h b/third_party/WebKit/Source/core/frame/LocalFrame.h
index 3c1b9143e3451afbc46ed08417c2ac5e6f288838..ab05a82b0dfede348ab2c8b950ac28b481652d84 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.h
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.h
@@ -218,6 +218,8 @@ class CORE_EXPORT LocalFrame final : public Frame,
 
   PluginData* pluginData() const;
 
+  bool isDetached() const { return m_detached; }
+
  private:
   friend class FrameNavigationDisabler;
 
@@ -257,6 +259,7 @@ class CORE_EXPORT LocalFrame final : public Frame,
   float m_textZoomFactor;
 
   bool m_inViewSourceMode;
+  bool m_detached = false;
 
   Member<InstrumentingAgents> m_instrumentingAgents;