Simplify starting a navigation

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 7851ab8bb01b3e63ba6d59742b348a111ba335ae..71a27dae60180736f65433c81e5731a0fb0d6928 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1331,6 +1331,10 @@ bool FrameLoader::shouldContinueForNavigationPolicy(const ResourceRequest& reque
         return false;
     }
 
+    bool isFormSubmission = type == NavigationTypeFormSubmitted || type == NavigationTypeFormResubmitted;
+    if (isFormSubmission && !m_frame->document()->contentSecurityPolicy()->allowFormAction(request.url()))
+        return false;
+
     policy = client()->decidePolicyForNavigation(request, loader, type, policy, replacesCurrentHistoryItem);
     if (policy == NavigationPolicyCurrentTab)
         return true;