[DevTools] Move sanitize url to devtools_ui.cc.

chrome/browser/devtools/devtools_window.cc

Index: chrome/browser/devtools/devtools_window.cc
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index 7875ce06d8b2d1f2fc4ab5d300c0b3b378c5d356..dd38dabf07b3062fc7505d48d31db84e6e827cd1 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -204,10 +204,8 @@ GURL DecorateFrontendURL(const GURL& base_url) {
     url_string += "&experiments=true";
 
   if (command_line->HasSwitch(switches::kDevToolsFlags)) {
-    std::string flags = command_line->GetSwitchValueASCII(
-                            switches::kDevToolsFlags);
-    flags = net::EscapeQueryParamValue(flags, false);
-    url_string += "&flags=" + flags;
+    url_string += "&" + command_line->GetSwitchValueASCII(
+        switches::kDevToolsFlags);
   }
 
 #if defined(DEBUG_DEVTOOLS)
@@ -902,7 +900,7 @@ GURL DevToolsWindow::GetDevToolsURL(Profile* profile,
   }
   if (can_dock)
     url_string += "&can_dock=true";
-  return GURL(url_string);
+  return DevToolsUI::SanitizeFrontendURL(GURL(url_string));
 }
 
 // static