Revert of [subresource_filter] Remove Forwarding NavigationThrottles

components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc

Index: components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc
diff --git a/components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc b/components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc
index 6b57efe16887a80688b7642f60bcaca6b9c30edf..a5e011072bd32d91d7b7a92decf885ff1b06ea8b 100644
--- a/components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc
+++ b/components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc
@@ -20,6 +20,37 @@
 
 namespace subresource_filter {
 
+namespace {
+
+// Used to forward calls to WillProcessResonse to the driver.
+// TODO(https://crbug.com/708181): Remove this once the safe browsing navigation
+// throttle is responsible for all activation decisions.
+class ForwardingNavigationThrottle : public content::NavigationThrottle {
+ public:
+  ForwardingNavigationThrottle(
+      content::NavigationHandle* handle,
+      ContentSubresourceFilterThrottleManager::Delegate* delegate)
+      : content::NavigationThrottle(handle), delegate_(delegate) {}
+  ~ForwardingNavigationThrottle() override {}
+
+  // content::NavigationThrottle:
+  content::NavigationThrottle::ThrottleCheckResult WillProcessResponse()
+      override {
+    delegate_->WillProcessResponse(navigation_handle());
+    return content::NavigationThrottle::PROCEED;
+  }
+  const char* GetNameForLogging() override {
+    return "ForwardingNavigationThrottle";
+  }
+
+ private:
+  ContentSubresourceFilterThrottleManager::Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ForwardingNavigationThrottle);
+};
+
+}  // namespace
+
 ContentSubresourceFilterThrottleManager::
     ContentSubresourceFilterThrottleManager(
         Delegate* delegate,
@@ -143,6 +174,10 @@
     content::NavigationHandle* navigation_handle,
     std::vector<std::unique_ptr<content::NavigationThrottle>>* throttles) {
   DCHECK(!navigation_handle->IsSameDocument());
+  if (navigation_handle->IsInMainFrame()) {
+    throttles->push_back(base::MakeUnique<ForwardingNavigationThrottle>(
+        navigation_handle, delegate_));
+  }
   if (!dealer_handle_)
     return;
   if (auto filtering_throttle =