Don't block blob URLs by webview URL filtering.

android_webview/browser/net/aw_network_delegate.cc

Index: android_webview/browser/net/aw_network_delegate.cc
diff --git a/android_webview/browser/net/aw_network_delegate.cc b/android_webview/browser/net/aw_network_delegate.cc
index 012a5f83fdf16dd55bf22b44893b91f9a9baaae4..5aab4e90b503b454cd639daf778396dafafac1ea 100644
--- a/android_webview/browser/net/aw_network_delegate.cc
+++ b/android_webview/browser/net/aw_network_delegate.cc
@@ -56,8 +56,13 @@ int AwNetworkDelegate::OnBeforeURLRequest(
     url_blacklist_manager_ =
         AwBrowserContext::GetDefault()->GetURLBlacklistManager();
   }
-  if (url_blacklist_manager_->IsURLBlocked(request->url()))
+  // Ignore blob scheme for two reasons:
+  // 1) PlzNavigate uses it to deliver the response to the renderer.
+  // 2) A whitelisted page can use blob URLs internally.
+  if (!request->url().SchemeIs(url::kBlobScheme) &&
+      url_blacklist_manager_->IsURLBlocked(request->url())) {
     return net::ERR_BLOCKED_BY_ADMINISTRATOR;
+  }
 
   return net::OK;
 }