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..15e87b4be67dbdc04da6030fdf07b11742f8d69d 100644
--- a/base/command_line.h
+++ b/base/command_line.h
@@ -183,6 +183,9 @@ class BASE_EXPORT CommandLine {
   void AppendSwitchASCII(const std::string& switch_string,
                          const std::string& value);
 
+  // Remove given switch from CommandLine.
+  void RemoveSwitchForTesting(const std::string& switch_string);
+
   // Copy a set of switches (and any values) from another command line.
   // Commonly used when launching a subprocess.
   void CopySwitchesFrom(const CommandLine& source,