Switch NaCl SDK release builders from svn to git

scripts/slave/recipes/client.nacl.sdk.recipe_autogen.expected/linux_sdk_multirel.json

 [
   {
     "cmd": [],
     "name": "ensure_goma"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::cipd]/resources/bootstrap.py",
@@ skipping 45 matching lines @@
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
-      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'custom_deps': {'src-pdf': None, 'src/pdf': None}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'chrome-official', 'url': 'svn://svn.chromium.org/chrome-internal/trunk/tools/buildspec/build/chrome-official'}]",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'custom_deps': {'src-pdf': None, 'src/pdf': None}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'chrome-official', 'url': 'https://chrome-internal.googlesource.com/chrome/tools/buildspec.git'}]",
       "--patch_root",
       "chrome-official",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/third_party/WebKit\": \"got_webkit_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "chrome-official@123456789abcdef",
@@ skipping 234 matching lines @@
       "[BUILD]/scripts/slave/chromium/nacl_sdk_buildbot_run.py"
     ],
     "name": "annotated_steps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]