Remove style checks and upgrade Robolectric

Bug: 112048937
Test: ./gradlew test
Change-Id: I4aa4bda4d5b422c49bada65f9e27bffc931bac15

PREUPLOAD.cfg

@@ -1,7 +1,4 @@
 [Hook Scripts]
-checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py
-                  --sha ${PREUPLOAD_COMMIT}
-                  --config_xml tools/checkstyle/checkstyle.xml
 
 [Builtin Hooks]
 commit_msg_test_field = true

library/self.gradle

@@ -51,8 +51,8 @@ android.sourceSets {
         java.srcDirs = ['test/robotest/src']
 
         dependencies {
-            testImplementation 'org.robolectric:robolectric:3.6.1'
-            testImplementation 'org.robolectric:shadows-framework:3.6.1'
+            testImplementation 'org.robolectric:robolectric:4.0-alpha-3'
+            testImplementation 'org.robolectric:shadows-framework:4.0-alpha-3'
             testImplementation 'junit:junit:4.+'
             testImplementation 'com.google.truth:truth:0.31'
             testImplementation 'org.mockito:mockito-core:1.9.5'

tools/checkstyle/checkstyle.xml

@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "http://www.puppycrawl.com/dtds/configuration_1_3.dtd" [
-  <!ENTITY defaultCopyrightCheck SYSTEM "../../../../../prebuilts/checkstyle/default-copyright-check.xml">
-  <!ENTITY defaultJavadocChecks SYSTEM "../../../../../prebuilts/checkstyle/default-javadoc-checks.xml">
-  <!ENTITY defaultTreewalkerChecks SYSTEM "../../../../../prebuilts/checkstyle/default-treewalker-checks.xml">
-  <!ENTITY defaultModuleChecks SYSTEM "../../../../../prebuilts/checkstyle/default-module-checks.xml">
-]>
-
-<module name="Checker">
-  &defaultModuleChecks;
-  &defaultCopyrightCheck;
-  <module name="TreeWalker">
-    &defaultJavadocChecks;
-    &defaultTreewalkerChecks;
-  </module>
-
-  <module name="SuppressionFilter">
-    <property name="file" value="tools/checkstyle/checkstyle_suppression.xml" />
-  </module>
-</module>

tools/checkstyle/checkstyle_suppression.xml

@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE suppressions PUBLIC "-//Puppy Crawl//DTD Suppressions 1.1//EN" "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
-<suppressions>
-
-    <!-- Note: Checkstyle puts the absolute path of files through the suppress filter, so the
-         patterns below will match sub-directories. Notably, for overlays where the path is
-         something like overlay/frameworks/opt/setupwizard will match the regex filter
-         "frameworks/opt/setupwizard". This is probably OK for most cases since they are overlay
-         of the original app and should have the same coding style. -->
-
-    <!-- Robolectric uses magic method names like `__constructor__` -->
-    <suppress files="/robotest/" checks="MethodName" />
-
-</suppressions>