[HTS] Use smaller resource for incognito tab icon

Bug: 851166

Change-Id: Icbd81a2dc22e274173ddf8f9cf79820c077f56ba
Reviewed-on: https://chromium-review.googlesource.com/c/1286765Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Pedro Amaral <amaralp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601770}

chrome/android/java/src/org/chromium/chrome/browser/toolbar/IncognitoToggleTabLayout.java

@@ -56,7 +56,7 @@ public class IncognitoToggleTabLayout extends TabLayout {
         mStandardButtonIcon.setContentDescription(
                 getResources().getString(R.string.accessibility_tab_switcher_standard_stack));
         mIncognitoButtonIcon = new AppCompatImageView(getContext());
-        mIncognitoButtonIcon.setImageResource(R.drawable.incognito_simple);
+        mIncognitoButtonIcon.setImageResource(R.drawable.incognito_small);
         mIncognitoButtonIcon.setContentDescription(getResources().getString(
                 ChromeFeatureList.isEnabled(ChromeFeatureList.INCOGNITO_STRINGS)
                         ? R.string.accessibility_tab_switcher_private_stack