/usr/share/app-install/desktop/unity-webapps-common:ubuntu-amazon-default.desktop is in app-install-data 14.04.0.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | [Desktop Entry]
X-AppInstall-Package=unity-webapps-common
X-AppInstall-Popcon=1
X-AppInstall-Section=main
Name=Amazon
Type=Application
Icon=amazon-store
Exec=unity-webapps-runner --amazon --app-id=ubuntu-amazon-default
X-Ubuntu-Gettext-Domain=app-install-data
|