Revert of Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky...

Revert of Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky (patchset #1 id:1 of https://codereview.chromium.org/1436163003/ )

Reason for revert:
dfalcantara@ fixed a larger issue with web apps tests on N4 devices. Reverting this in case of his CL fixed the problem.

Original issue's description:
> Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky
>
> Added in https://codereview.chromium.org/1414873004
>
> TBR=dfalcantara@chromium.org
> BUG=554929
>
> Committed: https://crrev.com/567ee4cbb84855641304da750f4865b95eb18054
> Cr-Commit-Position: refs/heads/master@{#359304}

TBR=dfalcantara@chromium.org,dgn@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=554929

Review URL: https://codereview.chromium.org/1453243005

Cr-Commit-Position: refs/heads/master@{#360636}

chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappSplashScreenIconTest.java

@@ -7,7 +7,6 @@ package org.chromium.chrome.browser.webapps;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.drawable.BitmapDrawable;
-import android.test.FlakyTest;
 import android.test.suitebuilder.annotation.SmallTest;
 import android.view.ViewGroup;
 import android.widget.ImageView;
@@ -39,11 +38,7 @@ public class WebappSplashScreenIconTest extends WebappActivityTestBase {
         startWebappActivity();
     }
 
-    /**
-     * Marked as flaky on http://crbug.com/554929
-     * @SmallTest
-     */
-    @FlakyTest
+    @SmallTest
     @Feature({"Webapps"})
     public void testShowSplashIcon() {
         ViewGroup splashScreen = getActivity().getSplashScreenForTests();