Revert of Mark AwContentsClientFullScreenTest#testPowerSaveBlockerIsT…

…ransferredToFullscreen as flaky. (patchset chromium#1 id:1 of https://codereview.chromium.org/893533006/)

Reason for revert:
Root cause reverted (https://codereview.chromium.org/888903002/) so enabling test again.

Not skipping cq

Original issue's description:
> Mark AwContentsClientFullScreenTest#testPowerSaveBlockerIsTransferredToFullscreen as flaky.
>
> TBR=torne
> NOTRY=true
> BUG=453857
>
> Committed: https://crrev.com/4be6e487bb78f3294657c9aca8ab13aaf641c2fa
> Cr-Commit-Position: refs/heads/master@{#313946}

TBR=torne@chromium.org,igsolla@chromium.org,tedchoc@chromium.org
BUG=453857

Review URL: https://codereview.chromium.org/890003003

Cr-Commit-Position: refs/heads/master@{#313974}

android_webview/javatests/src/org/chromium/android_webview/test/AwContentsClientFullScreenTest.java

@@ -5,7 +5,6 @@
 package org.chromium.android_webview.test;
 
 import android.os.Build;
-import android.test.FlakyTest;
 import android.test.suitebuilder.annotation.MediumTest;
 import android.view.KeyEvent;
 import android.view.View;
@@ -349,11 +348,8 @@ public void testPowerSaveBlockerIsEnabledDuringEmbeddedPlayback()
         assertWaitForKeepScreenOnActive(mTestContainerView, false);
     }
 
-    /*
     @MediumTest
     @Feature({"AndroidWebView"})
-    */
-    @FlakyTest
     public void testPowerSaveBlockerIsTransferredToFullscreen()
             throws Throwable {
         assertFalse(DOMUtils.isFullscreen(getWebContentsOnUiThread()));