Clarify that NTPSnippetsBridge holds a Java SnippetsBridge.

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
index 4625b133e6d759f246aafcec3dd53b68e7adb4b4..329aff2325f5094efe6b38e43e63c84405e614d7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
@@ -197,7 +197,6 @@ public class SnippetsBridge implements SuggestionsSource {
         assert mObserver == null || mObserver == observer;
 
         mObserver = observer;
-        nativeSetObserver(mNativeSnippetsBridge, observer == null ? null : this);
     }
 
     @Override
@@ -314,5 +313,4 @@ public class SnippetsBridge implements SuggestionsSource {
             long nativeNTPSnippetsBridge, int category, int position);
     private static native void nativeOnSuggestionTargetVisited(int category, long visitTimeMs);
     private static native void nativeOnNTPInitialized(long nativeNTPSnippetsBridge);
-    private native void nativeSetObserver(long nativeNTPSnippetsBridge, SnippetsBridge bridge);
 }