✈ Remove unnecessary flag and DocumentModeManager.

chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java
index 3598ec7ea0b6e9fcaa50a521d49b7669e20dda2a..900bfadefb68ef4bbfaf5ddf1b8ca49518466ce8 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabUmaTest.java
@@ -8,11 +8,9 @@ import android.os.Environment;
 import android.test.suitebuilder.annotation.MediumTest;
 
 import org.chromium.base.ThreadUtils;
-import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.MetricsUtils.HistogramDelta;
 import org.chromium.chrome.browser.ChromeActivity;
-import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabSelectionType;
 import org.chromium.chrome.test.ChromeActivityTestCaseBase;
@@ -59,7 +57,6 @@ public class TabUmaTest extends ChromeActivityTestCaseBase<ChromeActivity> {
      * Verify that Tab.StatusWhenSwitchedBackToForeground is correctly recording lazy loads.
      */
     @MediumTest
-    @CommandLineFlags.Add(ChromeSwitches.DISABLE_DOCUMENT_MODE)
     @Feature({"Uma"})
     public void testTabStatusWhenSwitchedToLazyLoads() throws ExecutionException {
         final Tab tab = ThreadUtils.runOnUiThreadBlocking(new Callable<Tab>() {