media: Use bundled Widevine CDM in encrypted media browser tests

chrome/test/base/test_launcher_utils.h

Index: chrome/test/base/test_launcher_utils.h
diff --git a/chrome/test/base/test_launcher_utils.h b/chrome/test/base/test_launcher_utils.h
index 24bd23db5d47e015c3e114ce2c026aab6215dcf8..8aea1221205ef5b8bfc4896ca90c69d8d8293e07 100644
--- a/chrome/test/base/test_launcher_utils.h
+++ b/chrome/test/base/test_launcher_utils.h
@@ -21,6 +21,13 @@ namespace test_launcher_utils {
 // when running under tests.
 void PrepareBrowserCommandLineForTests(base::CommandLine* command_line);
 
+// Appends all switches from |in_command_line| to |out_command_line| except for
+// |switch_to_remove|.
+// TODO(xhwang): Add CommandLine::RemoveSwitch() so we don't need this hack.
+void RemoveCommandLineSwitch(const base::CommandLine& in_command_line,
+                             const std::string& switch_to_remove,
+                             base::CommandLine* out_command_line);
+
 // Overrides the current process' user data dir.
 bool OverrideUserDataDir(
     const base::FilePath& user_data_dir) WARN_UNUSED_RESULT;