[DevTools] Do not use "settings" query param.

content/shell/browser/shell_devtools_frontend.cc

Index: content/shell/browser/shell_devtools_frontend.cc
diff --git a/content/shell/browser/shell_devtools_frontend.cc b/content/shell/browser/shell_devtools_frontend.cc
index d4ffd09b7f7866ed29409315485d797dde6cbb10..9b597db955a4c32bf9315e007a63d3e7645f3685 100644
--- a/content/shell/browser/shell_devtools_frontend.cc
+++ b/content/shell/browser/shell_devtools_frontend.cc
@@ -193,6 +193,21 @@ void ShellDevToolsFrontend::WebContentsDestroyed() {
   delete this;
 }
 
+void ShellDevToolsFrontend::SetPreferences(const std::string& json) {
+  preferences_.Clear();
+  if (json.empty())
+    return;
+  base::DictionaryValue* dict = nullptr;
+  std::unique_ptr<base::Value> parsed = base::JSONReader::Read(json);
+  if (!parsed || !parsed->GetAsDictionary(&dict))
+    return;
+  for (base::DictionaryValue::Iterator it(*dict); !it.IsAtEnd(); it.Advance()) {
+    if (!it.value().IsType(base::Value::TYPE_STRING))
+      continue;
+    preferences_.SetWithoutPathExpansion(it.key(), it.value().CreateDeepCopy());
+  }
+}
+
 void ShellDevToolsFrontend::HandleMessageFromDevToolsFrontend(
     const std::string& message) {
   if (!agent_host_)