Revert "Set background on correct view"

This change broke the build https://android-build.googleplex.com/builds/submitted/3300826/support_test_apks/latest/logs

This reverts commit def71dc0849a49f73f7a09de1e00d8ef4188f4b6.

Change-Id: I628376f0e37914380aef9f8cac006dc1f6ae4f86
diff --git a/design/src/android/support/design/widget/TextInputLayout.java b/design/src/android/support/design/widget/TextInputLayout.java
index 40adf2d..2bbaace 100644
--- a/design/src/android/support/design/widget/TextInputLayout.java
+++ b/design/src/android/support/design/widget/TextInputLayout.java
@@ -868,7 +868,7 @@
                 // as the background. This has the unfortunate side-effect of wiping out any
                 // user set padding, but I'd hope that use of custom padding on an EditText
                 // is limited.
-                ViewCompat.setBackground(mEditText, newBg);
+                ViewCompat.setBackground(mErrorView, newBg);
                 mHasReconstructedEditTextBackground = true;
             }
         }
diff --git a/design/tests/src/android/support/design/widget/TextInputLayoutTest.java b/design/tests/src/android/support/design/widget/TextInputLayoutTest.java
index 07c7488..fce619e 100755
--- a/design/tests/src/android/support/design/widget/TextInputLayoutTest.java
+++ b/design/tests/src/android/support/design/widget/TextInputLayoutTest.java
@@ -216,18 +216,6 @@
         onView(withId(R.id.textinput_edittext)).check(matches(not(isEnabled())));
     }
 
-    /**
-     * Regression test for b/31663756.
-     */
-    @Test
-    public void testDrawableStateChanged() {
-        final Activity activity = mActivityTestRule.getActivity();
-        final TextInputLayout layout = activity.findViewById(R.id.textinput);
-
-        // Force a drawable state change.
-        layout.drawableStateChanged();
-    }
-
     static ViewAssertion isHintExpanded(final boolean expanded) {
         return new ViewAssertion() {
             @Override