Fix naming

app/scripts/lib/controllers/preferences.js

@@ -24,7 +24,7 @@ class PreferencesController {
     return this.store.getState().selectedAddress
   }
 
-  addToFrequentRPCList (_url) {
+  addToFrequentRpcList (_url) {
     return new Promise((resolve, reject) => {
       let rpcList = this.getFrequentRPCList()
       let index = rpcList.findIndex((element) => { element === _url })
@@ -40,7 +40,7 @@ class PreferencesController {
     })
   }
 
-  getFrequentRPCList () {
+  getFrequentRpcList () {
     return this.store.getState().frequentRPCList
   }
 

app/scripts/metamask-controller.js

@@ -259,7 +259,7 @@ module.exports = class MetamaskController extends EventEmitter {
 
       // PreferencesController
       setSelectedAddress:        nodeify(preferencesController.setSelectedAddress).bind(preferencesController),
-      setFrequentRPCList:        nodeify(preferencesController.setFrequentRPCList).bind(preferencesController),
+      addToFrequentRpcList:      nodeify(preferencesController.addToFrequentRpcList).bind(preferencesController),
 
       // KeyringController
       setLocked:                 nodeify(keyringController.setLocked).bind(keyringController),