Python Style: Add a .style.yapf to //base/android.

Copied from //build/android/.style.yapf.

Ran "yapf -r -i --style base/android/.style.yapf base/android",
fixed a couple instances where the suggested changes weren't nice due
to complex statements, and fixed two long line issues.

Also updated testREForNatives to not have an unused variable.

Bug: 846432
Change-Id: Ic11f0bf808adaae03fbd2b2d6e819169f4e9bd60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622909
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662207}

diff --git a/base/android/jni_generator/PRESUBMIT.py b/base/android/jni_generator/PRESUBMIT.py
index bc76d5b..67e84a5 100644
--- a/base/android/jni_generator/PRESUBMIT.py
+++ b/base/android/jni_generator/PRESUBMIT.py

@@ -14,24 +14,24 @@
 
   env = dict(input_api.environ)
   env.update({
-    'PYTHONPATH': base_android_jni_generator_dir,
-    'PYTHONDONTWRITEBYTECODE': '1',
+      'PYTHONPATH': base_android_jni_generator_dir,
+      'PYTHONDONTWRITEBYTECODE': '1',
   })
 
   return input_api.canned_checks.RunUnitTests(
       input_api,
       output_api,
       unit_tests=[
-        input_api.os_path.join(
-            base_android_jni_generator_dir, 'jni_generator_tests.py')
+          input_api.os_path.join(base_android_jni_generator_dir,
+                                 'jni_generator_tests.py')
       ],
       env=env,
   )
 
 
 def CheckChangeOnUpload(input_api, output_api):
-    return CommonChecks(input_api, output_api)
+  return CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
-    return CommonChecks(input_api, output_api)
+  return CommonChecks(input_api, output_api)