Remove name parameter from HistogramAdd function.

webrtc/system_wrappers/include/metrics_default.h

Index: webrtc/system_wrappers/include/metrics_default.h
diff --git a/webrtc/system_wrappers/include/metrics_default.h b/webrtc/system_wrappers/include/metrics_default.h
index 94ba3cda321b7e1abea52d04d29958efeae4e52e..e262198e577b35a371b47a65c7ee2805e5b77dca 100644
--- a/webrtc/system_wrappers/include/metrics_default.h
+++ b/webrtc/system_wrappers/include/metrics_default.h
@@ -55,9 +55,6 @@ int NumSamples(const std::string& name);
 // Returns the minimum sample value (or -1 if the histogram has no samples).
 int MinSample(const std::string& name);
 
-// Function for adding a |sample| to a histogram without checkking the name.
-void HistogramAdd(Histogram* histogram_pointer, int sample);
-
 }  // namespace metrics
 }  // namespace webrtc