Share schemes needed for mixed content checking between the browser and renderer.

android_webview/renderer/aw_content_renderer_client.cc

Index: android_webview/renderer/aw_content_renderer_client.cc
diff --git a/android_webview/renderer/aw_content_renderer_client.cc b/android_webview/renderer/aw_content_renderer_client.cc
index c991f66c9746c8d0eea0b659670be0db08ded6aa..e0538b29f6feee852fcf5fa76bb93b3ebccdfd10 100644
--- a/android_webview/renderer/aw_content_renderer_client.cc
+++ b/android_webview/renderer/aw_content_renderer_client.cc
@@ -79,10 +79,6 @@ void AwContentRendererClient::RenderThreadStarted() {
   blink::WebString content_scheme(base::ASCIIToUTF16(url::kContentScheme));
   blink::WebSecurityPolicy::registerURLSchemeAsLocal(content_scheme);
 
-  blink::WebString aw_scheme(
-      base::ASCIIToUTF16(android_webview::kAndroidWebViewVideoPosterScheme));
-  blink::WebSecurityPolicy::registerURLSchemeAsSecure(aw_scheme);
-
 #if BUILDFLAG(ENABLE_SPELLCHECK)
   if (!spellcheck_) {
     spellcheck_ = base::MakeUnique<SpellCheck>();