Made all enums of preferences api unix_hacker_style

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 5335 matching lines @@
                   {
                     "name": "details",
                     "type": "object",
                     "description": "Details of the currently effective preference value.",
                     "properties": {
                       "value": {
                         "description": "The value of the preference.",
                         "type": "any"
                       },
                       "levelOfControl": {
-                        "description": "One of<br><var>NotControllable</var>: cannot be controlled by any extension<br><var>ControlledByOtherExtensions</var>: controlled by extensions with higher precedence<br><var>ControllableByThisExtension</var>: can be controlled by this extension<br><var>ControlledByThisExtension</var>: controlled by this extension",
+                        "description": "One of<br><var>not_controllable</var>: cannot be controlled by any extension<br><var>controlled_by_other_extensions</var>: controlled by extensions with higher precedence<br><var>controllable_by_this_extension</var>: can be controlled by this extension<br><var>controlled_by_this_extension</var>: controlled by this extension",
                         "type": "string",
-                        "enum": ["NotControllable", "ControlledByOtherExtensions", "ControllableByThisExtension", "ControlledByThisExtension"]
+                        "enum": ["not_controllable", "controlled_by_other_extensions", "controllable_by_this_extension", "controlled_by_this_extension"]
                       },
                       "incognitoSpecific": {
                         "description": "Whether the effective value is specific to the incognito session.<br>This property will <em>only</em> be present if the <var>incognito</var> property in the <var>details</var> parameter of <code>get()</code> was true.",
                         "type": "boolean",
                         "optional": true
                       }
                     }
                   }
                 ]
               }
@@ skipping 65 matching lines @@
             "parameters": [
               {
                 "type": "object",
                 "name": "details",
                 "properties": {
                   "value": {
                     "description": "The value of the preference.",
                     "type": "any"
                   },
                   "levelOfControl": {
-                    "description": "One of<br><var>NotControllable</var>: cannot be controlled by any extension<br><var>ControlledByOtherExtensions</var>: controlled by extensions with higher precedence<br><var>ControllableByThisExtension</var>: can be controlled by this extension<br><var>ControlledByThisExtension</var>: controlled by this extension",
+                    "description": "One of<br><var>not_controllable</var>: cannot be controlled by any extension<br><var>controlled_by_other_extensions</var>: controlled by extensions with higher precedence<br><var>controllable_by_this_extension</var>: can be controlled by this extension<br><var>controlled_by_this_extension</var>: controlled by this extension",
                     "type": "string",
-                    "enum": ["NotControllable", "ControlledByOtherExtensions", "ControllableByThisExtension", "ControlledByThisExtension"]
+                    "enum": ["not_controllable", "controlled_by_other_extensions", "controllable_by_this_extension", "controlled_by_this_extension"]
                   },
                   "incognitoSpecific": {
                     "description": "Whether the value that has changed is specific to the incognito session.<br>This property will <em>only</em> be present if the user has enabled the extension in incognito mode.",
                     "type": "boolean",
                     "optional": true
                   }
                 }
               }
             ]
           }
@@ skipping 138 matching lines @@
           {
             "type": "integer",
             "name": "tabId",
             "description": "The id of the tab that was detached."
           }
         ]
       }
     ]
   }
 ]