[chromedriver] Fallback to devtools for screenshotting of forbidden urls.

chrome/test/chromedriver/chrome/automation_extension.cc

Index: chrome/test/chromedriver/chrome/automation_extension.cc
diff --git a/chrome/test/chromedriver/chrome/automation_extension.cc b/chrome/test/chromedriver/chrome/automation_extension.cc
index 27999c8b85fb2c7a3f4bb1be407d6004f2ca6537..1a120a182233919eb7c83f9d288133c8961ce94e 100644
--- a/chrome/test/chromedriver/chrome/automation_extension.cc
+++ b/chrome/test/chromedriver/chrome/automation_extension.cc
@@ -24,7 +24,7 @@ Status AutomationExtension::CaptureScreenshot(std::string* screenshot) {
       base::TimeDelta::FromSeconds(10),
       &result);
   if (status.IsError())
-    return Status(kUnknownError, "cannot take screenshot", status);
+    return Status(status.code(), "cannot take screenshot", status);
   if (!result->GetAsString(screenshot))
     return Status(kUnknownError, "screenshot is not a string");
   return Status(kOk);