Task Manager: Remove dead FPS code.

chrome/common/extensions/api/processes.json

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "processes",
     "description": "Use the <code>chrome.processes</code> API to interact with the browser's processes.",
     "types": [
       {
@@ skipping 53 matching lines @@
           "jsMemoryUsed": {
             "type": "number",
             "optional": true,
             "description": "The most recent measurement of the process JavaScript memory used, in bytes. Only available when receiving the object as part of a callback from onUpdated or onUpdatedWithMemory."
           },
           "sqliteMemory": {
             "type": "number",
             "optional": true,
             "description": "The most recent measurement of the process’s SQLite memory usage, in bytes. Only available when receiving the object as part of a callback from onUpdated or onUpdatedWithMemory."
           },
-          "fps": {
-            "type": "number",
-            "optional": true,
-            "description": "The most recent measurement of the process frames per second. Only available when receiving the object as part of a callback from onUpdated or onUpdatedWithMemory."
-          },
           "imageCache": {
             "$ref": "Cache",
             "optional": true,
             "description": "The most recent information about the image cache for the process. Only available when receiving the object as part of a callback from onUpdated or onUpdatedWithMemory."
           },
           "scriptCache": {
             "$ref": "Cache",
             "optional": true,
             "description": "The most recent information about the script cache for the process. Only available when receiving the object as part of a callback from onUpdated or onUpdatedWithMemory."
           },
@@ skipping 173 matching lines @@
           {
             "name": "exitCode",
             "description": "The exit code if the process exited abnormally. Only available for renderer processes.",
             "type": "integer"
           }
         ]
       }
     ]
   }
 ]