Moved --top-chrome-md command line switch from chrome_switches to ui_base_switches.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6639dd8c758968e87445f1b2083b825f27aa212d..f80537fd6c267ee8eb25333e3254a321a4c950eb 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -426,6 +426,20 @@ const Experiment::Choice kAshScreenRotationAnimationChoices[] = {
 };
 #endif
 
+#if defined(ENABLE_TOPCHROME_MD)
+const Experiment::Choice kTopChromeMaterialDesignChoices[] = {
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},

[flackr, 2015/06/18 20:50:58]

Unless/until we make this an experiment where default is unknown, I think we
should not have an option labeled default but instead make the default option
the one which passes no flags.

When https://codereview.chromium.org/1191493004/ lands this option will have the
same formatting as unchanged regular switches when in its default value.

[bruthig, 2015/06/22 18:51:11]

Done.

+    {IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+     switches::kTopChromeMD,
+     switches::kTopChromeMDEnabled},
+    {IDS_FLAGS_TOP_CHROME_MD_HYBRID_ENABLED,
+     switches::kTopChromeMD,
+     switches::kTopChromeMDHybridEnabled},
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+     switches::kTopChromeMD,
+     switches::kTopChromeMDDisabled}};
+#endif
+
 #if defined(OS_CHROMEOS)
 const Experiment::Choice kDataSaverPromptChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
@@ -797,8 +811,7 @@ const Experiment kExperiments[] = {
      IDS_FLAGS_TOP_CHROME_MD,
      IDS_FLAGS_TOP_CHROME_MD_DESCRIPTION,
      kOsWin | kOsCrOS,
-     ENABLE_DISABLE_VALUE_TYPE(switches::kTopChromeMDEnabled,
-                               switches::kTopChromeMDDisabled)},
+     MULTI_VALUE_TYPE(kTopChromeMaterialDesignChoices)},
 #endif
     {"touch-events",
      IDS_TOUCH_EVENTS_NAME,