Use only toolbar to transition from fakebox to real omnibox.

chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java

Index: chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java b/chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java
index 4f00122909c21cd461854e5d347fde5d49629e10..4e5e6fcf395e676286f902030165fd6908fb7c11 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarPhone.java
@@ -173,7 +173,6 @@ public class LocationBarPhone extends LocationBarLayout {
         }
 
         mDeleteButton.setAlpha(percent);
-        mMicButton.setAlpha(percent);

[Ted C, 2016/07/19 19:11:31]

Hmm...this changes the behavior if you're focusing the omnibox and not just the
NTP.  What happens if you're on something like the recent tabs page where the is
no text in the omnibox so the mic icon will be present during the transition.

maybe the mic is hidden enough that this has no effect, but it seems odd that
we'd be animating the alpha of the delete button and not the mic when one or the
other is shown in the same place interchangeably

[Bernhard Bauer, 2016/07/21 13:10:03]

Well, this will keep the mic icon always visible in this case, so it will appear
behind the toolbar buttons when they slide out of view. I haven't been able to
see a difference to the behavior on trunk, probably because at the point when
the mic icon is uncovered the transition is already so far along that the alpha
value is almost 1 anyway. If you want consistency with the delete button, the
easiest thing to do would be to remove that call as well :) 

[Ted C, 2016/07/22 01:04:15]

Yeah, I thought so as much.  Please check in RTL if that holds true as well.

         if (showMenuButtonInOmnibox()) mMenuButtonWrapper.setAlpha(1f - percent);
 
         updateButtonVisibility();