Make all the rest of the recipes explicitly specify GIT_MODE

scripts/slave/recipes/mojo.expected/mojo_android_builder_tests_dbg.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.testing.master",
       "--builder",
       "Mojo Android Builder Tests (dbg)",
       "--slave",
       "TestSlavename",
       "--spec",
-      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/mojo.git'}]\ntarget_os = ['android']",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/mojo.git'}]\ntarget_os = ['android']",
       "--root",
       "src",
       "--revision_mapping_file",
       "{}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@HEAD",
@@ skipping 233 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "name": "Hello"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]