Remove the WARNING security level.

chrome/android/java/src/org/chromium/chrome/browser/tab/TopControlsVisibilityDelegate.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.tab;
 
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.device.DeviceClassManager;
 import org.chromium.chrome.browser.util.AccessibilityUtil;
 import org.chromium.components.security_state.ConnectionSecurityLevel;
@@ skipping 20 matching lines @@
     public boolean isHidingTopControlsEnabled() {
         WebContents webContents = mTab.getWebContents();
         if (webContents == null || webContents.isDestroyed()) return false;
 
         String url = mTab.getUrl();
         boolean enableHidingTopControls = url != null;
         enableHidingTopControls &= !url.startsWith(UrlConstants.CHROME_SCHEME);
         enableHidingTopControls &= !url.startsWith(UrlConstants.CHROME_NATIVE_SCHEME);
 
         int securityState = mTab.getSecurityLevel();
-        enableHidingTopControls &= (securityState != ConnectionSecurityLevel.SECURITY_ERROR
-                && securityState != ConnectionSecurityLevel.SECURITY_WARNING);
+        enableHidingTopControls &= (securityState != ConnectionSecurityLevel.SECURITY_ERROR);
 
         enableHidingTopControls &=
                 !AccessibilityUtil.isAccessibilityEnabled(mTab.getApplicationContext());
 
         ContentViewCore cvc = mTab.getContentViewCore();
         enableHidingTopControls &= cvc == null || !cvc.isFocusedNodeEditable();
         enableHidingTopControls &= !mTab.isShowingErrorPage();
         enableHidingTopControls &= !webContents.isShowingInterstitialPage();
         enableHidingTopControls &= (mTab.getFullscreenManager() != null);
         enableHidingTopControls &= DeviceClassManager.enableFullscreen();
         enableHidingTopControls &= !mTab.isFullscreenWaitingForLoad();
 
         return enableHidingTopControls;
     }
 
     /**
      * @return Whether showing top controls is enabled or not.
      */
     public boolean isShowingTopControlsEnabled() {
         if (mTab.getFullscreenManager() == null) return true;
         return !mTab.getFullscreenManager().getPersistentFullscreenMode();
     }
 }