Replace "enable-encrypted-media" flag with "disable-encrypted-media".

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 31a820824cb07768ed52b30d62dc6221bb003cfd..7315da64836715dd3c8fafcb2541d215e7fe95de 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -50341,6 +50341,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-1460462432" label="disable-media-source"/>
   <int value="-1433087548" label="enable-app-install-alerts"/>
   <int value="-1419788257" label="enable-experimental-hotwording"/>
+  <int value="-1411003295" label="disable-encrypted-media"/>
   <int value="-1408288176" label="enable-account-consistency"/>
   <int value="-1399753480" label="disable-harfbuzz-rendertext"/>
   <int value="-1399419572" label="enable-app-list"/>
@@ -50595,7 +50596,6 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1657713458" label="disable-virtual-keyboard-overscroll"/>
   <int value="1658644418" label="disable-app-list-voice-search"/>
   <int value="1661925474" label="silent-debugger-extension-api"/>
-  <int value="1668611601" label="enable-encrypted-media"/>

[Ilya Sherman, 2015/01/23 23:09:26]

Please preserve the original flag as well, so that old data remains viewable.

[ddorwin, 2015/01/23 23:28:42]

Done.

   <int value="1694854500" label="disable-save-password-bubble"/>
   <int value="1723601083" label="enable-app-window-controls"/>
   <int value="1730236697" label="force-device-scale-factor"/>