Reland r50057. This is exactly the same except with two lines cherrypicked from

Reland r50057. This is exactly the same except with two lines cherrypicked from
tony's CL 2814009 that tell make about the net_internals_resources_map.{cc,h}
files.

Load net-internals from the newly created resources.pak file.

This patch also forces the loading of the optional DataPack for const correctness reasons

Original Review: http://codereview.chromium.org/2855003

BUG=35793, 42770
TEST=none
TBR=tony

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=50257