Revert of Fix three causes of blank thumbnails.

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java
index 1ebdc7017971e107984a4baa03cf9693c0171c14..55c233376bd7d9b0bd13cfc6ed9867edcaf4c582 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabModelSelectorImpl.java
@@ -10,6 +10,7 @@
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.compositor.layouts.OverviewModeBehavior;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.ntp.NativePageFactory;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabSelectionType;
@@ -174,7 +175,11 @@
             @Override
             public void onPageLoadStarted(Tab tab, String url) {
                 String previousUrl = tab.getUrl();
-                mTabContentManager.invalidateTabThumbnail(tab.getId(), previousUrl);
+                if (NativePageFactory.isNativePageUrl(previousUrl, tab.isIncognito())) {
+                    mTabContentManager.invalidateTabThumbnail(tab.getId(), previousUrl);
+                } else {
+                    mTabContentManager.removeTabThumbnail(tab.getId());
+                }
             }
 
             @Override