Move RC4 behind a fallback.

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 98be29cefe59e1a83d403a6e1fd2beb066e5c632..cb807926dba6b9ed48c7e8b4b7751ddbd5435a38 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -17398,6 +17398,15 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Net.ConnectionUsedSSLDeprecatedCipherFallback"
+    enum="BooleanDeprecatedCiphers">
+  <owner>davidben@chromium.org</owner>
+  <summary>
+    True if an HTTPS connection was made using the deprecated cipher suite
+    fallback.
+  </summary>
+</histogram>
+
 <histogram name="Net.ConnectionUsedSSLv3Fallback">
   <obsolete>
     Replaced by Net.ConnectionUsedSSLVersionFallback in Chrome 21.
@@ -46092,6 +46101,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="1" label="Deleted"/>
 </enum>
 
+<enum name="BooleanDeprecatedCiphers" type="int">
+  <int value="0" label="Deprecated ciphers disabled"/>
+  <int value="1" label="Deprecated ciphers enabled"/>
+</enum>
+
 <enum name="BooleanDidEvict" type="int">
   <int value="0" label="Did not evict"/>
   <int value="1" label="Did evict"/>