I downloaded the source code of the default Browser application of the android from here
and tried it to build from the eclipse. It is showing various build error in
The default browser is not an "SDK" application. It is not developed with the SDK, but within the whole Android project. It has therefore access to internal class which are not exposed in the SDK.
So you can't build it as a regular app. You will have to build it along the whole Android project, which means download all the Android source code, and do at least one full Android build. And i'm not sure the resultant apk can be installed normally on a device.