Clean up DEPS files under Source/modules

- Remove rules in modules/DEPS or root DEPS as they get inherited.
- Omit third_party/WebKit/Source in modules/csspaint/DEPS
- Remove unnecessary explicit dependencies to subdirectories where whose
  parent is already included
- Remove a deps in modules/shapedetection/DEPS to non-existent directory
  heap

R=haraken@chromium.org
BUG=none

Review-Url: https://codereview.chromium.org/2778713002
Cr-Commit-Position: refs/heads/master@{#460050}
40 files changed