Move socket API from experimental to dev channel and remove some dead code

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.alarms.clear": "alarms.html#method-clear",
     "chrome.alarms.clearAll": "alarms.html#method-clearAll",
     "chrome.alarms.create": "alarms.html#method-create",
     "chrome.alarms.get": "alarms.html#method-get",
     "chrome.alarms.getAll": "alarms.html#method-getAll",
     "chrome.alarms.onAlarm": "alarms.html#event-onAlarm",
     "chrome.app.window.create": "app.window.html#method-create",
     "chrome.app.window.focus": "app.window.html#method-focus",
@@ skipping 166 matching lines @@
     "chrome.experimental.record.captureURLs": "experimental.record.html#method-captureURLs",
     "chrome.experimental.record.replayURLs": "experimental.record.html#method-replayURLs",
     "chrome.experimental.serial.close": "experimental.serial.html#method-close",
     "chrome.experimental.serial.flush": "experimental.serial.html#method-flush",
     "chrome.experimental.serial.getControlSignals": "experimental.serial.html#method-getControlSignals",
     "chrome.experimental.serial.getPorts": "experimental.serial.html#method-getPorts",
     "chrome.experimental.serial.open": "experimental.serial.html#method-open",
     "chrome.experimental.serial.read": "experimental.serial.html#method-read",
     "chrome.experimental.serial.setControlSignals": "experimental.serial.html#method-setControlSignals",
     "chrome.experimental.serial.write": "experimental.serial.html#method-write",
-    "chrome.experimental.socket.bind": "experimental.socket.html#method-bind",
-    "chrome.experimental.socket.connect": "experimental.socket.html#method-connect",
-    "chrome.experimental.socket.create": "experimental.socket.html#method-create",
-    "chrome.experimental.socket.destroy": "experimental.socket.html#method-destroy",
-    "chrome.experimental.socket.disconnect": "experimental.socket.html#method-disconnect",
-    "chrome.experimental.socket.read": "experimental.socket.html#method-read",
-    "chrome.experimental.socket.recvFrom": "experimental.socket.html#method-recvFrom",
-    "chrome.experimental.socket.sendTo": "experimental.socket.html#method-sendTo",
-    "chrome.experimental.socket.setKeepAlive": "experimental.socket.html#method-setKeepAlive",
-    "chrome.experimental.socket.setNoDelay": "experimental.socket.html#method-setNoDelay",
-    "chrome.experimental.socket.write": "experimental.socket.html#method-write",
     "chrome.experimental.speechInput.isRecording": "experimental.speechInput.html#method-isRecording",
     "chrome.experimental.speechInput.onError": "experimental.speechInput.html#event-onError",
     "chrome.experimental.speechInput.onResult": "experimental.speechInput.html#event-onResult",
     "chrome.experimental.speechInput.onSoundEnd": "experimental.speechInput.html#event-onSoundEnd",
     "chrome.experimental.speechInput.onSoundStart": "experimental.speechInput.html#event-onSoundStart",
     "chrome.experimental.speechInput.start": "experimental.speechInput.html#method-start",
     "chrome.experimental.speechInput.stop": "experimental.speechInput.html#method-stop",
     "chrome.experimental.usb.bulkTransfer": "experimental.usb.html#method-bulkTransfer",
     "chrome.experimental.usb.closeDevice": "experimental.usb.html#method-closeDevice",
     "chrome.experimental.usb.controlTransfer": "experimental.usb.html#method-controlTransfer",
@@ skipping 100 matching lines @@
     "chrome.runtime.getBackgroundPage": "runtime.html#method-getBackgroundPage",
     "chrome.runtime.getManifest": "runtime.html#method-getManifest",
     "chrome.runtime.getURL": "runtime.html#method-getURL",
     "chrome.runtime.onInstalled": "runtime.html#event-onInstalled",
     "chrome.runtime.onSuspend": "runtime.html#event-onSuspend",
     "chrome.runtime.onSuspendCanceled": "runtime.html#event-onSuspendCanceled",
     "chrome.scriptBadge.getAttention": "scriptBadge.html#method-getAttention",
     "chrome.scriptBadge.getPopup": "scriptBadge.html#method-getPopup",
     "chrome.scriptBadge.onClicked": "scriptBadge.html#event-onClicked",
     "chrome.scriptBadge.setPopup": "scriptBadge.html#method-setPopup",
+    "chrome.socket.bind": "socket.html#method-bind",
+    "chrome.socket.connect": "socket.html#method-connect",
+    "chrome.socket.create": "socket.html#method-create",
+    "chrome.socket.destroy": "socket.html#method-destroy",
+    "chrome.socket.disconnect": "socket.html#method-disconnect",
+    "chrome.socket.read": "socket.html#method-read",
+    "chrome.socket.recvFrom": "socket.html#method-recvFrom",
+    "chrome.socket.sendTo": "socket.html#method-sendTo",
+    "chrome.socket.setKeepAlive": "socket.html#method-setKeepAlive",
+    "chrome.socket.setNoDelay": "socket.html#method-setNoDelay",
+    "chrome.socket.write": "socket.html#method-write",
     "chrome.storage.StorageArea.clear": "storage.html#method-StorageArea-clear",
     "chrome.storage.StorageArea.get": "storage.html#method-StorageArea-get",
     "chrome.storage.StorageArea.getBytesInUse": "storage.html#method-StorageArea-getBytesInUse",
     "chrome.storage.StorageArea.remove": "storage.html#method-StorageArea-remove",
     "chrome.storage.StorageArea.set": "storage.html#method-StorageArea-set",
     "chrome.storage.onChanged": "storage.html#event-onChanged",
     "chrome.tabs.captureVisibleTab": "tabs.html#method-captureVisibleTab",
     "chrome.tabs.connect": "tabs.html#method-connect",
     "chrome.tabs.create": "tabs.html#method-create",
     "chrome.tabs.detectLanguage": "tabs.html#method-detectLanguage",
@@ skipping 2487 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples/api/extension/isAllowedAccess.zip"
     }
   ]
 }