Stop sending events and messages to content script contexts after their

chrome/renderer/extensions/chrome_v8_context_set.cc

Index: chrome/renderer/extensions/chrome_v8_context_set.cc
diff --git a/chrome/renderer/extensions/chrome_v8_context_set.cc b/chrome/renderer/extensions/chrome_v8_context_set.cc
index 4d8a222f6834fb8f839decc5167667c605bd70ed..3ec45261ce9c8642b46f0fa157c7eeabdc60026b 100644
--- a/chrome/renderer/extensions/chrome_v8_context_set.cc
+++ b/chrome/renderer/extensions/chrome_v8_context_set.cc
@@ -80,8 +80,7 @@ void ChromeV8ContextSet::Remove(ChromeV8Context* context) {
   }
 }
 
-ChromeV8ContextSet::ContextSet ChromeV8ContextSet::GetAll()
-    const {
+ChromeV8ContextSet::ContextSet ChromeV8ContextSet::GetAll() const {
   return contexts_;
 }
 
@@ -151,4 +150,19 @@ void ChromeV8ContextSet::DispatchChromeHiddenMethod(
   }
 }
 
+void ChromeV8ContextSet::OnExtensionUnloaded(const std::string& extension_id) {
+  ContextSet contexts = GetAll();
+
+  // Clean up contexts belonging to the unloaded extension. This is done so
+  // that content scripts (which remain injected into the page) don't continue
+  // receiving events and sending messages.
+  for (ContextSet::iterator it = contexts.begin(); it != contexts.end();
+       ++it) {
+    if ((*it)->extension() && (*it)->extension()->id() == extension_id) {
+      (*it)->DispatchOnUnloadEvent();
+      Remove(*it);
+    }
+  }
+}
+
 }  // namespace extensions