Migrate to Android Testing Support Lib (part 6/N)

This is a follow up CL to previous CLs that converted unit tests to
use Android Testing Support Library but forgot to remove unused import
lines.

Bug: 110805255
Test: verified as follows. No new test failures.
        tapas adb LatinIME LatinIMETests arm64 userdebug && \
        DISABLE_PROGUARD=true make -j LatinIME && \
        adb install -r $OUT/system/app/LatinIME/LatinIME.apk && \
        atest LatinIMETests:com.android.inputmethod.latin
Change-Id: I8762b0dfc209bdf68867f725b03a22286026faae
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSetTests.java b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSetTests.java
index 1a6f0d3..9921192 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSetTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSetTests.java
@@ -20,7 +20,6 @@
 import static org.junit.Assert.assertNotNull;
 
 import android.content.Context;
-import android.test.AndroidTestCase;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.filters.SmallTest;
 import android.support.test.runner.AndroidJUnit4;
diff --git a/tests/src/com/android/inputmethod/latin/utils/JsonUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/JsonUtilsTests.java
index e0a2b81..a9e40a7 100644
--- a/tests/src/com/android/inputmethod/latin/utils/JsonUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/JsonUtilsTests.java
@@ -18,14 +18,12 @@
 
 import static org.junit.Assert.assertEquals;
 
-import android.test.AndroidTestCase;
 import android.support.test.filters.SmallTest;
 import android.support.test.runner.AndroidJUnit4;
 
 import java.util.Arrays;
 import java.util.List;
 
-import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;