Only log Tabs.CountAtStartup for Tabbed mode.

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 4284d134df6d1b3e2bc243992162140b4daddcf1..c729183169d1d222abbe7b7fc9e6aad7afa0e2b4 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
@@ -7,7 +7,6 @@ package org.chromium.chrome.browser.tabmodel;
 import android.os.Handler;
 
 import org.chromium.base.VisibleForTesting;
-import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.compositor.layouts.OverviewModeBehavior;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
@@ -69,24 +68,6 @@ public class TabModelSelectorImpl extends TabModelSelectorBase implements TabMod
             public void onStateLoaded() {
                 markTabStateInitialized();
             }
-
-            @Override
-            public void onStateMerged() {
-            }
-
-            @Override
-            public void onDetailsRead(int index, int id, String url, boolean isStandardActiveIndex,
-                    boolean isIncognitoActiveIndex) {
-            }
-
-            @Override
-            public void onInitialized(int tabCountAtStartup) {
-                RecordHistogram.recordCountHistogram("Tabs.CountAtStartup", tabCountAtStartup);
-            }
-
-            @Override
-            public void onMetadataSavedAsynchronously() {
-            }
         };
         mIsUndoSupported = supportUndo;
         mTabSaver = new TabPersistentStore(