Do not format OpenGLES2 headers in build_gles2_cmd_buffer.py.

ppb_opengles2.h and ppb_opengles2ext_dev.h are no longer
generated by build_gles2_cmd_buffer.py, so it is not necessary
to format these files.

TEST=trybots
BUG=411799

Review URL: https://codereview.chromium.org/575423002

Cr-Commit-Position: refs/heads/master@{#295492}

gpu/command_buffer/build_gles2_cmd_buffer.py

@@ -8627,8 +8627,6 @@ def main(argv):
       mojo_gles2_prefix + "_autogen.h",
       mojo_gles2_prefix + "_chromium_texture_mailbox_autogen.h",
       mojo_gles2_prefix + "_chromium_sync_point_autogen.h",
-      "ppapi/c/dev/ppb_opengles2ext_dev.h",
-      "ppapi/c/ppb_opengles2.h",
       "ppapi/lib/gl/gles2/gles2.c",
       "ppapi/shared_impl/ppb_opengles2_shared.cc"])