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 2179214eacc78df6a4e4f6108b88da171faa9102..c450291d745ca3cd8822bf8cd95fd604e1378fd9 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1323,6 +1323,10 @@ 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;