[Script Injection] Allow whitelisted extensions to inject scripts everywhere

extensions/renderer/extension_injection_host.cc

Index: extensions/renderer/extension_injection_host.cc
diff --git a/extensions/renderer/extension_injection_host.cc b/extensions/renderer/extension_injection_host.cc
index 16b0831b6e2f4bd72537678c6d324fd450ff0ced..ec75068ed1244a1eb31fbcb240ccedf80accbaac 100644
--- a/extensions/renderer/extension_injection_host.cc
+++ b/extensions/renderer/extension_injection_host.cc
@@ -57,8 +57,10 @@ PermissionsData::AccessType ExtensionInjectionHost::CanExecuteOnFrame(
 
   blink::WebSecurityOrigin top_frame_security_origin =
       render_frame->GetWebFrame()->top()->securityOrigin();
+  // Only whitelisted extensions may run scripts on another extension's page.
   if (top_frame_security_origin.protocol().utf8() == kExtensionScheme &&
-      top_frame_security_origin.host().utf8() != extension_->id())
+      top_frame_security_origin.host().utf8() != extension_->id() &&
+      !PermissionsData::CanExecuteScriptEverywhere(extension_))
     return PermissionsData::ACCESS_DENIED;
 
   // Declarative user scripts use "page access" (from "permissions" section in