Navigation transitions (web to native app): Revert exit transition (Blink side)

LayoutTests/fast/html/navigation-transition.html

Index: LayoutTests/fast/html/navigation-transition.html
diff --git a/LayoutTests/fast/html/navigation-transition.html b/LayoutTests/fast/html/navigation-transition.html
index b6e93f0cefbf01e8773bcf255e9b3be581a0fe58..b09fe4805fe03ac8acb5d30682e84cabbc70fc8d 100644
--- a/LayoutTests/fast/html/navigation-transition.html
+++ b/LayoutTests/fast/html/navigation-transition.html
@@ -25,7 +25,6 @@ window.onload = function() {
         preHidingTransitionElementOpacity = window.getComputedStyle(transitionElement).opacity;
 
         internals.hideAllTransitionElements();
-
         postHidingTransitionElementOpacity = window.getComputedStyle(transitionElement).opacity;
         postHidingBottomElementRect = bottomElement.getBoundingClientRect();
 
@@ -41,6 +40,10 @@ window.onload = function() {
         shouldBe('preHidingBottomElementRect.top', 'postHidingBottomElementRect.top');
         shouldBe('preHidingBottomElementRect.left', 'postHidingBottomElementRect.left');
 
+        internals.showAllTransitionElements();
+        postShowingTransitionElementOpacity = window.getComputedStyle(transitionElement).opacity;
+        shouldBeTrue('postShowingTransitionElementOpacity == 1');
+
         finishJSTest();
     }
 }