DevTools: SVG Icons

This switches our icons to use svg instead of png. It replaces
the png optimizer with an svg optimizer.

Change-Id: I63f8de9059502ab952d39bbefe5da1f6d4708d37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643403
Commit-Queue: Joel Einbinder <[email protected]>
Reviewed-by: Erik Luo <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#667807}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 56a647b2510baf3b314fab1130dbe08c191c9072
diff --git a/scripts/README.md b/scripts/README.md
index 0a89e46..e7ac952 100644
--- a/scripts/README.md
+++ b/scripts/README.md
@@ -19,11 +19,10 @@
 - local_node - installs a local runtime of node.js
 
 ### Python Scripts
-- convert_svg_images_to_png.py - manually run when adding svg images
 - compile_frontend.py - runs closure compiler to do static type analysis
     - Note: the compiled outputs are not actually used to run DevTools
 - lint_javascript.py - run eslint
-- optimize_png_images.py - manually run when adding png images
+- optimize_svg_images.py - manually run when changing svg images
 
 ### Node.js scripts