remove getSource from rhpAPI

src/app.js

@@ -704,9 +704,6 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
       document.querySelector(`.${css.dragbar2}`).style.right = delta + 'px'
       onResize()
     },
-    getSource: (fileName) => {
-      return compiler.getSource(fileName)
-    },
     visitContracts: (cb) => {
       compiler.visitContracts(cb)
     },

src/app/tabs/compile-tab.js

@@ -191,7 +191,7 @@ function compileTab (appAPI = {}, appEvents = {}, opts = {}) {
       if (success) {
         contractNames.removeAttribute('disabled')
         appAPI.visitContracts((contract) => {
-          contractsDetails[contract.name] = parseContracts(contract.name, contract.object, appAPI.getSource(contract.file))
+          contractsDetails[contract.name] = parseContracts(contract.name, contract.object, opts.compiler.getSource(contract.file))
           var contractName = yo`
             <option>
               ${contract.name}