MD History: Disable by default

MD History is not launching in M54, so we are disabling it until
after branch point.

BUG=425625

Review-Url: https://codereview.chromium.org/2271533005
Cr-Commit-Position: refs/heads/master@{#414314}

chrome/common/chrome_features.cc

@@ -95,7 +95,7 @@ const base::Feature kPushMessagingBackgroundMode{
 
 // Enables or disables the Material Design version of chrome://history.
 const base::Feature kMaterialDesignHistory{
-    "MaterialDesignHistory", base::FEATURE_ENABLED_BY_DEFAULT};
+    "MaterialDesignHistory", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables or disables the Material Design version of chrome://settings.
 // Also affects chrome://help.