Rename experimental_accessibility to accessibility_private in histograms.

extensions/browser/extension_function_histogram_value.h

Index: extensions/browser/extension_function_histogram_value.h
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 86132ce82a17add56e3e0255591c094c66bef861..aa27e1af574b54b8a00dfc7a8f6721fdf0ce6374 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -143,7 +143,7 @@ enum HistogramValue {
   BOOKMARKS_EXPORT,
   HISTORY_SEARCH,
   TTSENGINE_SENDTTSEVENT,
-  EXPERIMENTAL_ACCESSIBILITY_GETALERTSFORTAB,
+  ACCESSIBILITY_PRIVATE_GETALERTSFORTAB,
   BOOKMARKS_IMPORT,
   SYNCFILESYSTEM_DELETEFILESYSTEM,
   DEBUGGER_SENDCOMMAND,
@@ -219,7 +219,7 @@ enum HistogramValue {
   FONTSETTINGS_GETFONTLIST,
   PERMISSIONS_CONTAINS,
   DELETED_SCRIPTBADGE_GETPOPUP,
-  EXPERIMENTAL_ACCESSIBILITY_GETFOCUSEDCONTROL,
+  ACCESSIBILITY_PRIVATE_GETFOCUSEDCONTROL,
   DEVELOPERPRIVATE_GETSTRINGS,
   METRICSPRIVATE_RECORDMEDIUMCOUNT,
   MANAGEMENT_GET,
@@ -366,7 +366,7 @@ enum HistogramValue {
   DIAL_DISCOVERNOW,
   TYPES_CHROMESETTING_SET,
   BROWSERACTION_SETICON,
-  EXPERIMENTAL_ACCESSIBILITY_SETACCESSIBILITYENABLED,
+  ACCESSIBILITY_PRIVATE_SETACCESSIBILITYENABLED,
   DELETED_FILEMANAGERPRIVATE_VIEWFILES,
   DELETED_BLUETOOTH_GETSERVICES,
   TABS_UPDATE,
@@ -524,7 +524,7 @@ enum HistogramValue {
   SOCKET_MULTICAST_SET_TIME_TO_LIVE,
   SOCKET_MULTICAST_SET_LOOPBACK_MODE,
   SOCKET_MULTICAST_GET_JOINED_GROUPS,
-  EXPERIMENTAL_ACCESSIBILITY_SETNATIVEACCESSIBILITYENABLED,
+  ACCESSIBILITY_PRIVATE_SETNATIVEACCESSIBILITYENABLED,
   RUNTIME_GETPLATFORMINFO,
   DELETED_WEBVIEW_INSERTCSS,
   METRICSPRIVATE_GETISCRASHRECORDINGENABLED,