Connect SparseHistogram with the rest of stats system

chrome/browser/net/http_pipelining_compatibility_client_unittest.cc

Index: chrome/browser/net/http_pipelining_compatibility_client_unittest.cc
diff --git a/chrome/browser/net/http_pipelining_compatibility_client_unittest.cc b/chrome/browser/net/http_pipelining_compatibility_client_unittest.cc
index 04dddfe7ea8a18641c7c2c853ec14698fe75815b..7f3379041512dfe06cdf0f7a3e8c9bdff703bbf8 100644
--- a/chrome/browser/net/http_pipelining_compatibility_client_unittest.cc
+++ b/chrome/browser/net/http_pipelining_compatibility_client_unittest.cc
@@ -25,7 +25,7 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::Histogram;
+using base::HistogramBase;
 using base::HistogramSamples;
 
 namespace chrome_browser_net {
@@ -210,8 +210,8 @@ class HttpPipeliningCompatibilityClientTest : public testing::Test {
  private:
   scoped_ptr<HistogramSamples> GetHistogram(const char* name) {
     scoped_ptr<HistogramSamples> samples;
-    Histogram* cached_histogram = NULL;
-    Histogram* current_histogram =
+    HistogramBase* cached_histogram = NULL;
+    HistogramBase* current_histogram =
         base::StatisticsRecorder::FindHistogram(name);
     if (ContainsKey(histograms_, name)) {
       cached_histogram = histograms_[name];
@@ -238,12 +238,12 @@ class HttpPipeliningCompatibilityClientTest : public testing::Test {
     return samples.Pass();
   }
 
-  static std::map<std::string, Histogram*> histograms_;
+  static std::map<std::string, HistogramBase*> histograms_;
   std::map<std::string, HistogramSamples*> original_samples_;
 };
 
 // static
-std::map<std::string, Histogram*>
+std::map<std::string, HistogramBase*>
     HttpPipeliningCompatibilityClientTest::histograms_;
 
 TEST_F(HttpPipeliningCompatibilityClientTest, Success) {