[Hotword] Reverse the experimental flag so that it is on by default.

chrome/browser/search/hotword_service_unittest.cc

Index: chrome/browser/search/hotword_service_unittest.cc
diff --git a/chrome/browser/search/hotword_service_unittest.cc b/chrome/browser/search/hotword_service_unittest.cc
index db1ce8681e62ea153d3a578b744a3564de12b237..a902495ad10828c202d87600d16e7bc2a90caeb4 100644
--- a/chrome/browser/search/hotword_service_unittest.cc
+++ b/chrome/browser/search/hotword_service_unittest.cc
@@ -95,9 +95,9 @@ class HotwordServiceTest :
 
   void SetUp() override {
     extension_id_ = GetParam();
-    if (extension_id_ == extension_misc::kHotwordSharedModuleId) {
+    if (extension_id_ == extension_misc::kHotwordExtensionId) {
       base::CommandLine::ForCurrentProcess()->AppendSwitch(
-          switches::kEnableExperimentalHotwording);
+          switches::kDisableExperimentalHotwording);
     }
 
     extensions::ExtensionServiceTestBase::SetUp();