breakpad doesn't build on v3.x branch

[timower]

Building the toltec image locally always fails at breakpad with:

150.9 Updating src/default.xml due to changed src/DEPS
150.9 Running: gclient root
150.9 Running: gclient config --spec 'solutions = [
150.9   {
150.9     "name": "src",
150.9     "url": "https://chromium.googlesource.com/breakpad/breakpad.git",
150.9     "managed": False,
150.9     "custom_deps": {},
150.9   },
150.9 ]
150.9 '
150.9 Running: gclient sync
150.9 Running: git submodule foreach 'git config -f $toplevel/.git/config submodule.$name.ignore all'
150.9 Running: git config --add remote.origin.fetch '+refs/tags/*:refs/tags/*'
150.9 Running: git config diff.ignoreSubmodules dirty
151.0 error: Your local changes to the following files would be overwritten by checkout:
151.0   default.xml
151.0 Please commit your changes or stash them before you switch branches.
151.0 Aborting

Seems like some dependency wasn't pinned correctly?