Fix the name of the file generated by generate_sslroots.py.

WebRTC filenames use underscores to separate words so the ssl roots
file is rtc_base/ssl_roots.h instead of rtc_base/sslroots.h.

Bug: chromium:978779
Change-Id: I2fa11c38a566e177775deb3d42230d956efc8ccc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173800
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31132}

tools_webrtc/sslroots/README.md

@@ -0,0 +1,23 @@
+# Generate rtc_base/ssl_roots.h
+
+This directory contains a script to generate the content of
+[rtc_base/ssl_roots.h][ssl-roots-header], to update the SSL roots shipped
+by WebRTC follow this instructions:
+
+1. Download roots.pem from [pki.goog][pki-goog].
+
+2. Launch the script:
+
+```
+$ python tools_webrtc/sslroots/generate_sslroots.py roots.pem
+```
+
+3. Step 2 should have generated an ssl_roots.h file right next to roots.pem.
+
+4. Open rtc_base/ssl_roots.h, manually remove the old certificates and paste
+   the ones from the ssl_roots.h file.
+
+5. Delete the generated ssl_roots.h and roots.pem before creating the CL.
+
+[ssl-roots-header]: https://cs.chromium.org/chromium/src/third_party/webrtc/rtc_base/ssl_roots.h
+[pki-goog]: https://www.google.com/url?q=https://pki.google.com/roots.pem

tools_webrtc/sslroots/generate_sslroots.py

@@ -25,7 +25,7 @@ import os
 import re
 import string
 
-_GENERATED_FILE = 'sslroots.h'
+_GENERATED_FILE = 'ssl_roots.h'
 _PREFIX = '__generated__'
 _EXTENSION = '.crt'
 _SUBJECT_NAME_ARRAY = 'subject_name'