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

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 009ba7f7ea06813b52eafd164babd3e317d28b9e..939af5ab97c228d982c6a55608006f9a95b1d8d8 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -50,6 +50,7 @@
 #include "public/platform/BlameContext.h"
 #include "public/platform/WebColor.h"
 #include "public/platform/WebCommon.h"
+#include "public/platform/WebContentSecurityPolicy.h"
 #include "public/platform/WebContentSecurityPolicyStruct.h"
 #include "public/platform/WebEffectiveConnectionType.h"
 #include "public/platform/WebFeaturePolicy.h"
@@ -302,6 +303,8 @@ class BLINK_EXPORT WebFrameClient {
     WebFormElement form;
     bool isCacheDisabled;
     WebSourceLocation sourceLocation;
+    WebContentSecurityPolicyDisposition
+        shouldCheckMainWorldContentSecurityPolicy;
 
     NavigationPolicyInfo(WebURLRequest& urlRequest)
         : extraData(nullptr),
@@ -311,7 +314,9 @@ class BLINK_EXPORT WebFrameClient {
           replacesCurrentHistoryItem(false),
           isHistoryNavigationInNewChildFrame(false),
           isClientRedirect(false),
-          isCacheDisabled(false) {}
+          isCacheDisabled(false),
+          shouldCheckMainWorldContentSecurityPolicy(
+              WebContentSecurityPolicyDispositionCheck) {}
   };
 
   virtual WebNavigationPolicy decidePolicyForNavigation(