Messaging: Remove compatibility for old android versions

Change-Id: Id9065d60525a509271a0e64c0e349e857cb998e2

src/com/android/messaging/ui/mediapicker/MediaChooser.java

@@ -34,7 +34,6 @@ import com.android.messaging.datamodel.data.MediaPickerData;
 import com.android.messaging.datamodel.data.DraftMessageData.DraftMessageSubscriptionDataProvider;
 import com.android.messaging.ui.BasePagerViewHolder;
 import com.android.messaging.util.Assert;
-import com.android.messaging.util.OsUtil;
 
 abstract class MediaChooser extends BasePagerViewHolder
         implements DraftMessageSubscriptionDataProvider {
@@ -107,8 +106,7 @@ abstract class MediaChooser extends BasePagerViewHolder
     }
 
     protected FragmentManager getFragmentManager() {
-        return OsUtil.isAtLeastJB_MR1() ? mMediaPicker.getChildFragmentManager() :
-                mMediaPicker.getFragmentManager();
+        return mMediaPicker.getChildFragmentManager();
     }
     protected LayoutInflater getLayoutInflater() {
         return LayoutInflater.from(getContext());

src/com/android/messaging/ui/mediapicker/MediaPickerPanel.java

@@ -31,7 +31,6 @@ import android.widget.LinearLayout;
 import com.android.messaging.R;
 import com.android.messaging.ui.PagingAwareViewPager;
 import com.android.messaging.util.Assert;
-import com.android.messaging.util.OsUtil;
 import com.android.messaging.util.UiUtils;
 
 /**
@@ -202,7 +201,7 @@ public class MediaPickerPanel extends ViewGroup {
     private int getDesiredHeight() {
         if (mFullScreen) {
             int fullHeight = getContext().getResources().getDisplayMetrics().heightPixels;
-            if (OsUtil.isAtLeastKLP() && isAttachedToWindow()) {
+            if (isAttachedToWindow()) {
                 // When we're attached to the window, we can get an accurate height, not necessary
                 // on older API level devices because they don't include the action bar height
                 View composeContainer =