Chrome 70 removed the "Build" part:
Chrome 69: ...(Linux; Android 4.2.1; en-us; Nexus 5 Build/JOP40D) AppleWebKit...
Chrome 70: ...(Linux; Android 4.2.1; en-us; Nexus 5) AppleWebKit...
But it doesn't change in webview:
...(Linux; Android 4.2.1; en-us; Nexus 5 Build/JOP40D; wv) AppleWebKit...