For historical reasons gyp_webrtc.py was launcher script for gyp_webrtc and the python logic lived in the gyp_webrtc. This change moves python code into the .py file makes the extension-free gyp_webrtc a launcher for gyp_webrtc.py. Other changes: * Move the code into a main() function. * Add call to disable GC to save some processing time. * Set executable permission on gyp_webrtc.py and remove it from gyp_webrtc. Similar Chromium CL: https://codereview.chromium.org/1216863010 Motivation for this change: * Gets checked with PyLint * Easy to add unit tests if we add our own functionality. R=phoglund@webrtc.org TBR=tkchin@webrtc.org Review URL: https://codereview.webrtc.org/1895713002 . Cr-Commit-Position: refs/heads/master@{#12410}