Support Using ScopedFeatureList in BrowserTest

base/command_line.h

Index: base/command_line.h
diff --git a/base/command_line.h b/base/command_line.h
index 3d29f8fee7fbb8de9e8c1fb691515ddb8bdccbdd..446cfb552373b15d410833358fe3cc1306f0f98d 100644
--- a/base/command_line.h
+++ b/base/command_line.h
@@ -182,6 +182,8 @@ class BASE_EXPORT CommandLine {
                           const StringType& value);
   void AppendSwitchASCII(const std::string& switch_string,
                          const std::string& value);
+  void ReplaceSwitchASCIIForTest(const std::string& switch_string,
+                                 const std::string& value);
 
   // Copy a set of switches (and any values) from another command line.
   // Commonly used when launching a subprocess.