Remove StackLayout#uiPreemptivelySelectTabModel()

StackLayout#uiPreemptivelySelectTabModel() is a one-line method that just calls
StackLayout#onTabModelSwitched(). I don't think there's really any extra clarity
added by the separate method name, so I'm removing this method so I don't have
to deal with it when splitting a base class off of StackLayout.

Bug: 648314
Change-Id: I187051e51e0593060808ef4f6824bf742df483f9
Reviewed-on: https://chromium-review.googlesource.com/957560Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Ryan Landay <rlanday@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542271}

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/phone/StackLayout.java

@@ -453,7 +453,7 @@ public class StackLayout extends Layout implements Animatable<StackLayout.Proper
         startMarginAnimation(true);
 
         // Animate the stack to leave incognito mode.
-        if (!mStacks.get(1).isDisplayable()) uiPreemptivelySelectTabModel(false);
+        if (!mStacks.get(1).isDisplayable()) onTabModelSwitched(false);
     }
 
     @Override
@@ -464,7 +464,7 @@ public class StackLayout extends Layout implements Animatable<StackLayout.Proper
         // trigger the overlap animation.
         startMarginAnimation(true);
         // Animate the stack to leave incognito mode.
-        if (!mStacks.get(1).isDisplayable()) uiPreemptivelySelectTabModel(false);
+        if (!mStacks.get(1).isDisplayable()) onTabModelSwitched(false);
     }
 
     @Override
@@ -558,7 +558,7 @@ public class StackLayout extends Layout implements Animatable<StackLayout.Proper
             startMarginAnimation(false);
         }
 
-        uiPreemptivelySelectTabModel(newIsIncognito);
+        onTabModelSwitched(newIsIncognito);
     }
 
     @Override
@@ -649,7 +649,7 @@ public class StackLayout extends Layout implements Animatable<StackLayout.Proper
 
         // Make sure we show/hide both stacks depending on which tab we're closing.
         startMarginAnimation(true, incognitoVisible);
-        if (!incognitoVisible) uiPreemptivelySelectTabModel(false);
+        if (!incognitoVisible) onTabModelSwitched(false);
     }
 
     /**
@@ -685,10 +685,6 @@ public class StackLayout extends Layout implements Animatable<StackLayout.Proper
         doneShowing();
     }
 
-    private void uiPreemptivelySelectTabModel(boolean incognito) {
-        onTabModelSwitched(incognito);
-    }
-
     /**
      * Starts the animation for the opposite stack to slide in or out when entering
      * or leaving stack view.  The animation should be super fast to match more or less