WebLayer: Move InterceptNavigationDelegate throttle initialization

Throttle isn't safe browsing related and doesn't needed to be guarded
by a safebrowsing flag check.

Change-Id: Ie59c7a9c87141b378cecc5ba4befdb97d21a2ca2
Bug: 1141329
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490168Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819836}

weblayer/browser/content_browser_client_impl.cc

@@ -712,13 +712,11 @@ ContentBrowserClientImpl::CreateThrottlesForNavigation(
       throttles.push_back(
           GetSafeBrowsingService()->CreateSafeBrowsingNavigationThrottle(
               handle));
-      if (handle->IsInMainFrame()) {
-        throttles.push_back(
-            navigation_interception::InterceptNavigationDelegate::
-                CreateThrottleFor(
-                    handle, navigation_interception::SynchronyMode::kAsync));
-      }
     }
+
+    throttles.push_back(
+        navigation_interception::InterceptNavigationDelegate::CreateThrottleFor(
+            handle, navigation_interception::SynchronyMode::kAsync));
   }
 #endif
   return throttles;