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

third_party/WebKit/Source/web/WebLocalFrameImpl.h

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.h
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.h b/third_party/WebKit/Source/web/WebLocalFrameImpl.h
index 5c8a850034753b73c6615c4d46f5ec2dbe4b9627..0ba3d7dce9a9bc8ac958ebc81acc3fe160542d6a 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.h
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.h
@@ -72,6 +72,7 @@ class WebView;
 class WebViewImpl;
 enum class WebFrameLoadType;
 struct FrameLoadRequest;
+struct WebContentSecurityPolicyViolation;
 struct WebPrintParams;
 
 template <typename T>
@@ -260,6 +261,8 @@ class WEB_EXPORT WebLocalFrameImpl final
                 WebHistoryLoadType,
                 bool isClientRedirect) override;
   bool maybeRenderFallbackContent(const WebURLError&) const override;
+  void contentSecurityPolicyViolation(
+      const blink::WebContentSecurityPolicyViolation&) override;
   bool isLoading() const override;
   bool isNavigationScheduledWithin(double interval) const override;
   void setCommittedFirstRealLoad() override;