Revert of 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 939af5ab97c228d982c6a55608006f9a95b1d8d8..009ba7f7ea06813b52eafd164babd3e317d28b9e 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -50,7 +50,6 @@
 #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"
@@ -303,8 +302,6 @@
     WebFormElement form;
     bool isCacheDisabled;
     WebSourceLocation sourceLocation;
-    WebContentSecurityPolicyDisposition
-        shouldCheckMainWorldContentSecurityPolicy;
 
     NavigationPolicyInfo(WebURLRequest& urlRequest)
         : extraData(nullptr),
@@ -314,9 +311,7 @@
           replacesCurrentHistoryItem(false),
           isHistoryNavigationInNewChildFrame(false),
           isClientRedirect(false),
-          isCacheDisabled(false),
-          shouldCheckMainWorldContentSecurityPolicy(
-              WebContentSecurityPolicyDispositionCheck) {}
+          isCacheDisabled(false) {}
   };
 
   virtual WebNavigationPolicy decidePolicyForNavigation(