[DevTools] Remove legacy code.

chrome/browser/devtools/devtools_ui_bindings.cc

Index: chrome/browser/devtools/devtools_ui_bindings.cc
diff --git a/chrome/browser/devtools/devtools_ui_bindings.cc b/chrome/browser/devtools/devtools_ui_bindings.cc
index 964dc991b80277391c796ab6b23595e9af9b4fd6..88e80738e75faa5050f2bfceb9a4d7f0e4512f98 100644
--- a/chrome/browser/devtools/devtools_ui_bindings.cc
+++ b/chrome/browser/devtools/devtools_ui_bindings.cc
@@ -819,10 +819,8 @@ void DevToolsUIBindings::AddDevToolsExtensionsToClient() {
                                 extensions::APIPermission::kExperimental)));
     results.Append(extension_info);
   }
-  // TODO(dgozman): remove the |WebInspector.addExtensions| call in M45.
-  CallClientFunction(
-      "(InspectorFrontendAPI.addExtensions || WebInspector.addExtensions)",
-      &results, NULL, NULL);
+  CallClientFunction("InspectorFrontendAPI.addExtensions",
+                     &results, NULL, NULL);
 }
 
 void DevToolsUIBindings::SetDelegate(Delegate* delegate) {