Remove a bunch of broken/unused/non-useful NTP UMA histograms

chrome/browser/ui/webui/ntp/ntp_user_data_logger_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/search/ntp_logging_events.h"
@@ skipping 32 matching lines @@
 TEST_F(NTPUserDataLoggerTest, TestLogging) {
   base::StatisticsRecorder::Initialize();
 
   // Enusure non-zero statistics.
   TestNTPUserDataLogger logger;
 
   base::TimeDelta delta = base::TimeDelta::FromMilliseconds(0);
 
   for (int i = 0; i < 8; ++i)
     logger.LogEvent(NTP_TILE, delta);
-  for (int i = 0; i < 4; ++i)
-    logger.LogEvent(NTP_THUMBNAIL_TILE, delta);
-  for (int i = 0; i < 2; ++i)
-    logger.LogEvent(NTP_THUMBNAIL_ERROR, delta);
-  logger.LogEvent(NTP_GRAY_TILE_FALLBACK, delta);
-  logger.LogEvent(NTP_EXTERNAL_TILE_FALLBACK, delta);
-  for (int i = 0; i < 2; ++i)
-    logger.LogEvent(NTP_EXTERNAL_TILE, delta);
-  for (int i = 0; i < 2; ++i)
-    logger.LogEvent(NTP_GRAY_TILE, delta);
   logger.LogEvent(NTP_SERVER_SIDE_SUGGESTION, delta);
 
   logger.EmitNtpStatistics(NTPUserDataLogger::EmitReason::NAVIGATED_AWAY);
 
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfTiles"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfTiles", 8));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailTiles"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfThumbnailTiles", 4));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailErrors"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfThumbnailErrors", 2));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTileFallbacks"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfGrayTileFallbacks", 1));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTileFallbacks"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfExternalTileFallbacks", 1));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTiles"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfExternalTiles", 2));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTiles"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.NumberOfGrayTiles", 2));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.SuggestionsType"));
-  EXPECT_EQ(1, GetBinCount("NewTabPage.SuggestionsType", 1));
 
   // Statistics should be reset to 0, so we should not log anything else.
   logger.EmitNtpStatistics(NTPUserDataLogger::EmitReason::NAVIGATED_AWAY);
   EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfTiles"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailTiles"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfThumbnailErrors"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTileFallbacks"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTileFallbacks"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfExternalTiles"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.NumberOfGrayTiles"));
-  EXPECT_EQ(1, GetTotalCount("NewTabPage.SuggestionsType"));
 }
 
 TEST_F(NTPUserDataLoggerTest, TestLogMostVisitedImpression) {
   base::StatisticsRecorder::Initialize();
 
   EXPECT_EQ(0, GetTotalCount("NewTabPage.SuggestionsImpression"));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.server", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.server", 5));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.client", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.SuggestionsImpression.client", 5));
@@ skipping 61 matching lines @@
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.client", 1));
   EXPECT_EQ(0, GetBinCount("NewTabPage.MostVisited.client", 5));
 
   logger.LogMostVisitedNavigation(5, NTPLoggingTileSource::CLIENT);
   EXPECT_EQ(4, GetTotalCount("NewTabPage.MostVisited"));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.server", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.server", 5));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.client", 1));
   EXPECT_EQ(1, GetBinCount("NewTabPage.MostVisited.client", 5));
 }