remove blockchain context method

src/app/ui/universal-dapp-ui.js

@@ -59,7 +59,7 @@ class UniversalDAppUI {
     address = (address.slice(0, 2) === '0x' ? '' : '0x') + address.toString('hex')
     address = ethJSUtil.toChecksumAddress(address)
     const instance = yo`<div class="instance ${css.instance} ${css.hidesub}" id="instance${address}"></div>`
-    const context = this.blockchain.context()
+    const context = (this.blockchain.getProvider() === 'vm' ? 'memory' : 'blockchain')
 
     function toggleClass (e) {
       $(instance).toggleClass(`${css.hidesub}`)

src/blockchain/blockchain.js

@@ -373,10 +373,6 @@ class Blockchain {
     })
   }
 
-  context () {
-    return (this.executionContext.isVM() ? 'memory' : 'blockchain')
-  }
-
   /**
    * This function send a tx only to javascript VM or testnet, will return an error for the mainnet
    * SHOULD BE TAKEN CAREFULLY!