diff --git a/content/base/public/nsContentUtils.h b/content/base/public/nsContentUtils.h
index 8c68acc8ca37..b8f77b15a2fa 100644
--- a/content/base/public/nsContentUtils.h
+++ b/content/base/public/nsContentUtils.h
@@ -76,6 +76,7 @@ class nsIParser;
 class nsIParserService;
 class nsIPresShell;
 class nsIPrincipal;
+class nsIRequest;
 class nsIRunnable;
 class nsIScriptContext;
 class nsIScriptGlobalObject;
@@ -2173,6 +2174,11 @@ public:
    */
   static bool IsForbiddenResponseHeader(const nsACString& aHeader);
 
+  /**
+   * Returns the inner window ID for the window associated with a request,
+   */
+  static uint64_t GetInnerWindowID(nsIRequest* aRequest);
+
 private:
   static bool InitializeEventTable();
 
diff --git a/content/base/src/nsCSPContext.cpp b/content/base/src/nsCSPContext.cpp
index 79152757273f..e573dc69e218 100644
--- a/content/base/src/nsCSPContext.cpp
+++ b/content/base/src/nsCSPContext.cpp
@@ -18,7 +18,6 @@
 #include "nsIDOMHTMLDocument.h"
 #include "nsIDOMHTMLElement.h"
 #include "nsIDOMNode.h"
-#include "nsIDOMWindowUtils.h"
 #include "nsIHttpChannel.h"
 #include "nsIInterfaceRequestor.h"
 #include "nsIInterfaceRequestorUtils.h"
@@ -491,47 +490,6 @@ nsCSPContext::LogViolationDetails(uint16_t aViolationType,
 
 #undef CASE_CHECK_AND_REPORT
 
-uint64_t
-getInnerWindowID(nsIRequest* aRequest) {
-  // can't do anything if there's no nsIRequest!
-  if (!aRequest) {
-    return 0;
-  }
-
-  nsCOMPtr<nsILoadGroup> loadGroup;
-  nsresult rv = aRequest->GetLoadGroup(getter_AddRefs(loadGroup));
-
-  if (NS_FAILED(rv) || !loadGroup) {
-    return 0;
-  }
-
-  nsCOMPtr<nsIInterfaceRequestor> callbacks;
-  rv = loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
-  if (NS_FAILED(rv) || !callbacks) {
-    return 0;
-  }
-
-  nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
-  if (!loadContext) {
-    return 0;
-  }
-
-  nsCOMPtr<nsIDOMWindow> window;
-  rv = loadContext->GetAssociatedWindow(getter_AddRefs(window));
-  if (NS_FAILED(rv) || !window) {
-    return 0;
-  }
-
-  nsCOMPtr<nsPIDOMWindow> pwindow = do_QueryInterface(window);
-  if (!pwindow) {
-    return 0;
-  }
-
-  nsPIDOMWindow* inner = pwindow->IsInnerWindow() ? pwindow.get() : pwindow->GetCurrentInnerWindow();
-
-  return inner ? inner->WindowID() : 0;
-}
-
 NS_IMETHODIMP
 nsCSPContext::SetRequestContext(nsIURI* aSelfURI,
                                 nsIURI* aReferrer,
@@ -550,7 +508,7 @@ nsCSPContext::SetRequestContext(nsIURI* aSelfURI,
   NS_ASSERTION(mSelfURI, "No aSelfURI and no URI available from channel in SetRequestContext, can not translate 'self' into actual URI");
 
   if (aChannel) {
-    mInnerWindowID = getInnerWindowID(aChannel);
+    mInnerWindowID = nsContentUtils::GetInnerWindowID(aChannel);
     aChannel->GetLoadGroup(getter_AddRefs(mCallingChannelLoadGroup));
 
     // Storing the nsINode from the LoadInfo of the original channel,
diff --git a/content/base/src/nsContentUtils.cpp b/content/base/src/nsContentUtils.cpp
index 33358827edd1..c4adf16fdc07 100644
--- a/content/base/src/nsContentUtils.cpp
+++ b/content/base/src/nsContentUtils.cpp
@@ -137,6 +137,7 @@
 #include "nsIParserService.h"
 #include "nsIPermissionManager.h"
 #include "nsIPluginHost.h"
+#include "nsIRequest.h"
 #include "nsIRunnable.h"
 #include "nsIScriptContext.h"
 #include "nsIScriptError.h"
@@ -6963,3 +6964,45 @@ nsContentUtils::IsJavascriptMIMEType(const nsAString& aMIMEType)
 
   return false;
 }
+
+uint64_t
+nsContentUtils::GetInnerWindowID(nsIRequest* aRequest)
+{
+  // can't do anything if there's no nsIRequest!
+  if (!aRequest) {
+    return 0;
+  }
+
+  nsCOMPtr<nsILoadGroup> loadGroup;
+  nsresult rv = aRequest->GetLoadGroup(getter_AddRefs(loadGroup));
+
+  if (NS_FAILED(rv) || !loadGroup) {
+    return 0;
+  }
+
+  nsCOMPtr<nsIInterfaceRequestor> callbacks;
+  rv = loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
+  if (NS_FAILED(rv) || !callbacks) {
+    return 0;
+  }
+
+  nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
+  if (!loadContext) {
+    return 0;
+  }
+
+  nsCOMPtr<nsIDOMWindow> window;
+  rv = loadContext->GetAssociatedWindow(getter_AddRefs(window));
+  if (NS_FAILED(rv) || !window) {
+    return 0;
+  }
+
+  nsCOMPtr<nsPIDOMWindow> pwindow = do_QueryInterface(window);
+  if (!pwindow) {
+    return 0;
+  }
+
+  nsPIDOMWindow* inner = pwindow->IsInnerWindow() ? pwindow.get() : pwindow->GetCurrentInnerWindow();
+
+  return inner ? inner->WindowID() : 0;
+}
diff --git a/content/base/src/nsCrossSiteListenerProxy.cpp b/content/base/src/nsCrossSiteListenerProxy.cpp
index ab238ea0bfc3..6a2ea5122a4c 100644
--- a/content/base/src/nsCrossSiteListenerProxy.cpp
+++ b/content/base/src/nsCrossSiteListenerProxy.cpp
@@ -48,25 +48,7 @@ LogBlockedRequest(nsIRequest* aRequest)
   nsresult rv = NS_OK;
 
   // Get the innerWindowID associated with the XMLHTTPRequest
-  uint64_t innerWindowID = 0;
-
-  nsCOMPtr<nsILoadGroup> loadGroup;
-  aRequest->GetLoadGroup(getter_AddRefs(loadGroup));
-  if (loadGroup) {
-    nsCOMPtr<nsIInterfaceRequestor> callbacks;
-    loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
-    if (callbacks) {
-      nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
-      if(loadContext) {
-        nsCOMPtr<nsIDOMWindow> window;
-        loadContext->GetAssociatedWindow(getter_AddRefs(window));
-        if (window) {
-          nsCOMPtr<nsIDOMWindowUtils> du = do_GetInterface(window);
-          du->GetCurrentInnerWindowID(&innerWindowID);
-        }
-      }
-    }
-  }
+  uint64_t innerWindowID = nsContentUtils::GetInnerWindowID(aRequest);
 
   if (!innerWindowID) {
     return NS_ERROR_FAILURE;