Make sure the default CSP is used for <webview> with PlzNavigate.

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index 49bb0a80c6668ca622c8f67c3f73a39ee05078f3..9173dc82d38d060123d4d7055d95f140863d795c 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -36,6 +36,7 @@
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/renderer_host/chrome_navigation_ui_data.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/task_manager/web_contents_tags.h"
 #include "chrome/browser/ui/bluetooth/chrome_extension_bluetooth_chooser.h"
@@ -47,6 +48,7 @@
 #include "components/update_client/update_client.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/render_process_host.h"
+#include "content/public/browser/resource_request_info.h"
 #include "content/public/common/content_switches.h"
 #include "extensions/browser/api/generated_api_registration.h"
 #include "extensions/browser/extension_function_registry.h"
@@ -418,6 +420,20 @@ bool ChromeExtensionsBrowserClient::IsActivityLoggingEnabled(
   return activity_log && activity_log->is_active();
 }
 
+ExtensionNavigationUIData*
+ChromeExtensionsBrowserClient::GetExtensionNavigationUIData(
+    net::URLRequest* request) {
+  const content::ResourceRequestInfo* info =
+      content::ResourceRequestInfo::ForRequest(request);
+  if (!info)
+    return nullptr;
+  ChromeNavigationUIData* navigation_data =
+      static_cast<ChromeNavigationUIData*>(info->GetNavigationUIData());
+  if (!navigation_data)
+    return nullptr;
+  return navigation_data->GetExtensionNavigationUIData();
+}
+
 KioskDelegate* ChromeExtensionsBrowserClient::GetKioskDelegate() {
   if (!kiosk_delegate_)
     kiosk_delegate_.reset(new ChromeKioskDelegate());