Fix a bug in updating physical backing size

chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java
index e829c4d36ab34a19d5337b5d3bf1c19c29c4b46a..d8071cc3757fc6ba3f04f1092d164d05b68fa9ad 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/FullscreenWebContentsActivityTest.java
@@ -19,7 +19,6 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.test.util.CommandLineFlags;
-import org.chromium.base.test.util.FlakyTest;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.test.ChromeActivityTestRule;
 import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
@@ -138,7 +137,6 @@ public class FullscreenWebContentsActivityTest {
 
     @Test
     @MediumTest
-    @FlakyTest(message = "https://crbug.com/721906")
     public void testExitOnBack() throws Throwable {
         final FullscreenWebContentsActivity fullscreenActivity = enterFullscreen();
         mUiThreadTestRule.runOnUiThread(new Runnable() {