Android is a variant of Linux, but this breaks the matching process.

In the matching process, any request with Linux as a platform will also
match a node with Android as a platform. This does not make sense since
a test for Chrome/Linux could end up running in an Appium-Android node.

For the same reasons iOS had already family set to null, therefore now
setting family to null for Android.

java/client/src/org/openqa/selenium/Platform.java

@@ -199,7 +199,7 @@ public Platform family() {
   ANDROID("android", "dalvik") {
     @Override
     public Platform family() {
-      return LINUX;
+      return null;
     }
   },
 

java/client/test/org/openqa/selenium/PlatformTest.java

@@ -20,6 +20,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.openqa.selenium.Platform.ANDROID;
 import static org.openqa.selenium.Platform.ANY;
+import static org.openqa.selenium.Platform.IOS;
 import static org.openqa.selenium.Platform.LINUX;
 import static org.openqa.selenium.Platform.MAC;
 import static org.openqa.selenium.Platform.UNIX;
@@ -63,11 +64,6 @@ public void testUnixIsNotLinux() {
     assertThat(UNIX.is(LINUX)).isFalse();
   }
 
-  @Test
-  public void androidIsAUnixVariant() {
-    assertThat(ANDROID.is(UNIX)).isTrue();
-  }
-
   @Test
   public void testXpIsAny() {
     assertThat(XP.is(ANY)).isTrue();
@@ -139,6 +135,16 @@ public void unixIsUnix() {
     assertThat(UNIX.is(UNIX)).isTrue();
   }
 
+  @Test
+  public void androidIAndroid() {
+    assertThat(ANDROID.is(ANDROID)).isTrue();
+  }
+
+  @Test
+  public void iosIsIos() {
+    assertThat(IOS.is(IOS)).isTrue();
+  }
+
   @Test
   public void testWindows8Detection() {
     assertThat(Platform.extractFromSysProperty("windows nt (unknown)", "6.2")).isEqualTo(Platform.WIN8);