Delete the mojo config from the gclient recipe module.

The repo it references is obsolete and I've been requested to delete it.

Bug: 963195
Change-Id: I4e765465950f85d4bdcb604804959ff29a00f062
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1611591
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

recipes/README.recipes.md

@@ -933,7 +933,7 @@ Raises:
 
 [DEPS](/recipes/recipe_modules/gclient/examples/full.py#5): [gclient](#recipe_modules-gclient), [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/path][recipe_engine/recipe_modules/path], [recipe\_engine/properties][recipe_engine/recipe_modules/properties], [recipe\_engine/step][recipe_engine/recipe_modules/step]
 
-— **def [RunSteps](/recipes/recipe_modules/gclient/examples/full.py#53)(api):**
+— **def [RunSteps](/recipes/recipe_modules/gclient/examples/full.py#52)(api):**
 ### *recipes* / [gclient:tests/patch\_project](/recipes/recipe_modules/gclient/tests/patch_project.py)
 
 [DEPS](/recipes/recipe_modules/gclient/tests/patch_project.py#9): [gclient](#recipe_modules-gclient), [recipe\_engine/buildbucket][recipe_engine/recipe_modules/buildbucket], [recipe\_engine/properties][recipe_engine/recipe_modules/properties]

recipes/recipe_modules/gclient/config.py

@@ -262,12 +262,6 @@ def pdfium(c):
   m = c.got_revision_mapping
   m['pdfium'] = 'got_revision'
 
-@config_ctx()
-def mojo(c):
-  soln = c.solutions.add()
-  soln.name = 'src'
-  soln.url = 'https://chromium.googlesource.com/external/mojo.git'
-
 @config_ctx()
 def crashpad(c):
   soln = c.solutions.add()

recipes/recipe_modules/gclient/examples/full.py

@@ -36,7 +36,6 @@ TEST_CONFIGS = [
   'luci_go',
   'luci_py',
   'master_deps',
-  'mojo',
   'nacl',
   'openscreen',
   'pdfium',