It's working in other extensions so there must be something else in your case. If you can't provide a demo extension that shows the problem, there's nothing to do here, I'm afraid. 

using this line its working before chrome update 

code : 

const VFD = {
	extensionId: "myid",
	strPort: port,
	strFirstLine: " WELCOME",
	strSecondLine: "",
	write: function(strFirstLine, strSecondLine) {
		if (typeof chrome != "undefined") {
			this.strFirstLine = strFirstLine;
			this.strSecondLine = strSecondLine;

			if (this.strPort != "" && this.strFirstLine != "") {
				var messageToken = {
					"port": this.strPort,
					"firstLine": this.strFirstLine,
					"secondLine": this.strSecondLine,
				}

				chrome.runtime.sendMessage(this.extensionId, messageToken, this.onSend);
			}
		}
	},
	onSend: function(response) {

	},

error message : TypeError: Cannot read property 'sendMessage' of undefined

This part of code doesn't help to diagnose the underlying problem, unfortunately. 

can you please tell me if anything which is related to extension has been added in this latest version of chrome .

because i am not able to see any thing which is related to extension is listed in chrome release note. 

Each release adds dozens of internal changes that affect extensions. Like I said, without an actual extension that demonstrates the problem, nothing can be done here. 

i am trying all function which is related to chrome.runtime but not working

PFA

Deleted: chrome.png 53.5 KB

	chrome.png 53.5 KB View Download

You can try finding the cause yourself:
https://www.chromium.org/developers/bisect-builds-py

ttplshared@ - Thanks for filing the issue...!!

Could you please provide a sample test file/url to test the issue from TE-end.
This will help us in triaging the issue further.

Thanks...!!

java script code using at my end :

const VFD = {
	extensionId: "myid",
	strPort: port,
	strFirstLine: " WELCOME",
	strSecondLine: "",
	write: function(strFirstLine, strSecondLine) {
		if (typeof chrome != "undefined") {
			this.strFirstLine = strFirstLine;
			this.strSecondLine = strSecondLine;

			if (this.strPort != "" && this.strFirstLine != "") {
				var messageToken = {
					"port": this.strPort,
					"firstLine": this.strFirstLine,
					"secondLine": this.strSecondLine,
				}

				chrome.runtime.sendMessage(this.extensionId, messageToken, this.onSend);
			}
		}
	},
	onSend: function(response) {

	},

};




chrome extension code : 

PFA for chrome extension files

Deleted: manifest.json 341 bytes

manifest.json 341 bytes View Download

Deleted: scripts.js 3.2 KB

scripts.js 3.2 KB View Download

The error occur in my client side(javascript) code on chrome.runtime.sendMessage(this.extensionId, messageToken, this.onSend); this line 

even i am trying to access any methos or properties of chrome.runtime it gives type error

i think problem is not with the extention code problem is with "chrome.runtime" 

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

u can try at u r end only call "chrome.runtime.id" in javascript 

it also gives type error