Remove enhanced bookmarks sync experiment

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 7907011c76aee799a6b2c4be0c289222572fef6d..a7fa207749d66b8599ab1dd829696533842c6d8a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -6801,17 +6801,6 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
-<histogram name="EnhancedBookmarks.SyncExperimentState"
-    enum="BookmarksExperimentState">

[Yaron, 2015/03/16 19:41:20]

You can remove the <enum> too

[Mark P, 2015/03/16 19:46:13]

Do not remove a histogram declaration here.  Instead, mark it as <obsolete> with
the appropriate explanation.

[Mike Wittman, 2015/03/16 20:15:48]

Done.

-  <owner>noyau@chromium.org</owner>
-  <owner>yefim@chromium.org</owner>
-  <summary>
-    Captures the state the enhanced bookmark experiment is in. Recorded on
-    startup. To be removed once the enhanced bookmark experiment is finished.
-    see crbug/323423.
-  </summary>
-</histogram>
-
 <histogram name="Enterprise.AutoEnrollmentExtraTime" units="milliseconds">
   <owner>mnissler@chromium.org</owner>
   <summary>
@@ -52818,7 +52807,6 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="824961931" label="use-simple-cache-backend"/>
   <int value="834326277" label="enable-answers-in-suggest"/>
   <int value="835018878" label="disable-quic"/>
-  <int value="838887742" label="manual-enhanced-bookmarks"/>

[Mark P, 2015/03/16 19:46:14]

Please do not remove this or the enum below.  It helps keep the data in logs
interpretable.

[Mike Wittman, 2015/03/16 20:15:48]

Done.

   <int value="851085848" label="enable-settings-window"/>
   <int value="855746780" label="disable-physical-keyboard-autocorrect"/>
   <int value="857445869" label="enable-captive-portal-bypass-proxy"/>
@@ -52846,7 +52834,6 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1087235172" label="file-manager-enable-new-audio-player"/>
   <int value="1090377940" label="enable-quic-https"/>
   <int value="1095061640" label="enable-prominent-url-app-flow"/>
-  <int value="1104948452" label="manual-enhanced-bookmarks-optout"/>
   <int value="1105439588" label="enable-swipe-selection"/>
   <int value="1107543566" label="enable-one-copy"/>
   <int value="1108663108" label="disable-device-discovery-notifications"/>