Revert of PlzNavigate: Enforce 'frame-src' CSP on the browser.

content/browser/frame_host/frame_tree_node.cc

Index: content/browser/frame_host/frame_tree_node.cc
diff --git a/content/browser/frame_host/frame_tree_node.cc b/content/browser/frame_host/frame_tree_node.cc
index 2fdd79c55b1d9dc58ea8b75bce1127ca4e190dbb..be14c709c0a6ab7a14fa17d07840ed5fc735b758 100644
--- a/content/browser/frame_host/frame_tree_node.cc
+++ b/content/browser/frame_host/frame_tree_node.cc
@@ -291,14 +291,17 @@
 }
 
 void FrameTreeNode::AddContentSecurityPolicy(
-    const ContentSecurityPolicyHeader& header) {
+    const ContentSecurityPolicyHeader& header,
+    const std::vector<ContentSecurityPolicy>& policies) {
   replication_state_.accumulated_csp_headers.push_back(header);
   render_manager_.OnDidAddContentSecurityPolicy(header);
-}
-
-void FrameTreeNode::ResetCspHeaders() {
+  csp_policies_.insert(csp_policies_.end(), policies.begin(), policies.end());
+}
+
+void FrameTreeNode::ResetContentSecurityPolicy() {
   replication_state_.accumulated_csp_headers.clear();
   render_manager_.OnDidResetContentSecurityPolicy();
+  csp_policies_.clear();
 }
 
 void FrameTreeNode::SetInsecureRequestPolicy(