Change WebRTC SslCipher to be exposed as number only.

talk/app/webrtc/fakemetricsobserver.h

Index: talk/app/webrtc/fakemetricsobserver.h
diff --git a/talk/app/webrtc/fakemetricsobserver.h b/talk/app/webrtc/fakemetricsobserver.h
index 39454bf4db48862a32b0b7d7b64ed6a1bc184502..80797a1d9049aba15f677e2620effa0fbda496e0 100644
--- a/talk/app/webrtc/fakemetricsobserver.h
+++ b/talk/app/webrtc/fakemetricsobserver.h
@@ -46,14 +46,10 @@ class FakeMetricsObserver : public MetricsObserverInterface {
                             int counter_max) override;
   void AddHistogramSample(PeerConnectionMetricsName type,
                           int value) override;
-  void AddHistogramSample(PeerConnectionMetricsName type,
-                          const std::string& value) override;
 
   // Accessors to be used by the tests.
   int GetEnumCounter(PeerConnectionEnumCounterType type, int counter) const;
-  int GetIntHistogramSample(PeerConnectionMetricsName type) const;
-  const std::string& GetStringHistogramSample(
-      PeerConnectionMetricsName type) const;
+  int GetHistogramSample(PeerConnectionMetricsName type) const;
 
  protected:
   ~FakeMetricsObserver() {}
@@ -63,8 +59,7 @@ class FakeMetricsObserver : public MetricsObserverInterface {
   // This is a 2 dimension array. The first index is the enum counter type. The
   // 2nd index is the counter of that particular enum counter type.
   std::vector<std::vector<int>> counters_;
-  int int_histogram_samples_[kPeerConnectionMetricsName_Max];
-  std::string string_histogram_samples_[kPeerConnectionMetricsName_Max];
+  int histogram_samples_[kPeerConnectionMetricsName_Max];
 };
 
 }  // namespace webrtc