Revert "Add histograms to track down the cause of ERR_SSL_PROTOCOL_ERROR."

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 64412fa77a6508dd5bf27e1d4ff0bc7b9dbeff2a..13b9d70b5eb755788adfc03cdf2fc3c122c3d9c0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -28531,6 +28531,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Net.SSLProtocolErrorCipher" enum="SSLCipherSuite">
+  <obsolete>
+    Removed in March 2016.
+  </obsolete>
   <owner>davidben@chromium.org</owner>
   <summary>
     The cipher suite used when the corresponding operation on an SSLClientSocket
@@ -28540,6 +28543,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Net.SSLProtocolErrorReason" enum="BoringSSLReasonCode">
+  <obsolete>
+    Removed in March 2016.
+  </obsolete>
   <owner>davidben@chromium.org</owner>
   <summary>
     The internal, version-specific BoringSSL error reason reported when the
@@ -60689,6 +60695,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </enum>
 
 <enum name="BoringSSLReasonCode" type="int">
+  <obsolete>
+    Removed in March 2016.
+  </obsolete>
   <details>
     See include/openssl/ssl.h at the corresponding BoringSSL revision for the
     corresponding values.