Ntp: delete dead code and fix broken JavaDoc.

Review-Url: https://codereview.chromium.org/2286703002
Cr-Commit-Position: refs/heads/master@{#415313}

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageUma.java

@@ -55,8 +55,6 @@ public class NewTabPageUma {
     private static final int RAPPOR_ACTION_NAVIGATED_USING_OMNIBOX = 0;
     // User navigated to a page using one of the suggested tiles.
     public static final int RAPPOR_ACTION_VISITED_SUGGESTED_TILE = 1;
-    // The number of possible actions pertinent to Rappor
-    private static final int RAPPOR_NUM_ACTIONS = 2;
 
     // Regular NTP impression (usually when a new tab is opened)
     public static final int NTP_IMPRESSION_REGULAR = 0;

chrome/android/java/src/org/chromium/chrome/browser/ntp/RecentlyClosedBridge.java

@@ -24,7 +24,7 @@ public class RecentlyClosedBridge {
         /**
          * This method will be called every time the list of recently closed tabs is updated.
          *
-         * It's a good place to call {@link RecentlyClosedBridge#getRecentlyClosedTabs()} to get the
+         * It's a good place to call {@link RecentlyClosedBridge#getRecentlyClosedTabs} to get the
          * updated list of tabs.
          */
         @CalledByNative("RecentlyClosedCallback")