Remove yapf, mypy, and pylint from requirements.in

These packages are specified as requirements of the pw_presubmit
package.

Change-Id: I897a560aee7db41fecca3fac32c58456e58ae056
diff --git a/env_setup/virtualenv/requirements.in b/env_setup/virtualenv/requirements.in
index c484850..c2c4c2a 100644
--- a/env_setup/virtualenv/requirements.in
+++ b/env_setup/virtualenv/requirements.in
@@ -19,12 +19,6 @@
 # To help manage these files.
 pip-tools
 
-# Code quality tools.
-# TODO(hepler): Create a setup.py for the presubmit and remove these.
-yapf
-mypy
-pylint
-
 # For documentation generation.
 # TODO(frolv): Create a setup.py for pw_docgen and remove these.
 sphinx
diff --git a/env_setup/virtualenv/requirements.txt b/env_setup/virtualenv/requirements.txt
index 43c5e9d..d3ede8b 100644
--- a/env_setup/virtualenv/requirements.txt
+++ b/env_setup/virtualenv/requirements.txt
@@ -5,31 +5,22 @@
 #    pip-compile requirements.in
 #
 alabaster==0.7.12         # via sphinx
-astroid==2.3.3            # via pylint
 babel==2.7.0              # via sphinx
 certifi==2019.9.11        # via requests
 chardet==3.0.4            # via requests
 click==7.0                # via pip-tools
-coloredlogs==10.0
 docutils==0.15.2          # via sphinx
-humanfriendly==4.18       # via coloredlogs
 idna==2.8                 # via requests
 imagesize==1.1.0          # via sphinx
-isort==4.3.21             # via pylint
 jinja2==2.10.3            # via sphinx
-lazy-object-proxy==1.4.3  # via astroid
 markupsafe==1.1.1         # via jinja2
-mccabe==0.6.1             # via pylint
-mypy-extensions==0.4.3    # via mypy
-mypy==0.740
 packaging==19.2           # via sphinx
 pip-tools==4.2.0
 pygments==2.4.2           # via sphinx
-pylint==2.4.4
 pyparsing==2.4.5          # via packaging
 pytz==2019.3              # via babel
 requests==2.22.0          # via sphinx
-six==1.13.0               # via astroid, packaging, pip-tools
+six==1.13.0               # via packaging, pip-tools
 snowballstemmer==2.0.0    # via sphinx
 sphinx-rtd-theme==0.4.3
 sphinx==2.2.1
@@ -39,11 +30,7 @@
 sphinxcontrib-jsmath==1.0.1  # via sphinx
 sphinxcontrib-qthelp==1.0.2  # via sphinx
 sphinxcontrib-serializinghtml==1.1.3  # via sphinx
-typed-ast==1.4.0          # via astroid, mypy
-typing-extensions==3.7.4.1  # via mypy
 urllib3==1.25.7           # via requests
-wrapt==1.11.2             # via astroid
-yapf==0.28.0
 
 # The following packages are considered to be unsafe in a requirements file:
-# setuptools==42.0.1        # via sphinx
+# setuptools==42.0.2        # via sphinx