Drop ntp_snippets::kStudyName in chrome://flags

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java
index 67bf0a134f5188ceb18f4b67da158716e8d7b4ad..154a25c6dee799b93d632a670c2ba7e4991d550a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/CardsVariationParameters.java
@@ -23,7 +23,6 @@ public final class CardsVariationParameters {
     private static final String TAG = "CardsVariationParams";
 
     // Also defined in ntp_snippets_constants.cc
-    private static final String FIELD_TRIAL_NAME_MAIN = "NTPSnippets";
     private static final String FIELD_TRIAL_NAME_VISIBILITY = "NTPSnippetsVisibility";
 
     private static final String PARAM_FAVICON_SERVICE_NAME = "favicons_fetch_from_service";
@@ -38,6 +37,9 @@ public final class CardsVariationParameters {
 
     private static final int FIRST_CARD_ANIMATION_DEFAULT_VALUE = 7;
 
+    // TODO(sfiera): replace with feature-specific field trials, as has been done in C++.
+    private static final String FIELD_TRIAL_NAME_MAIN = "NTPSnippets";
+
     private CardsVariationParameters() {}
 
     // TODO(jkrcal): Do a proper general fix in VariationsAssociatedData in the spirit of