Bug 1245692 - Make CalendarView use full width of dialog r=sebastian

Squashing CalendarView makes it look bad and hard to use - by allowing
it to expand to the dialog width we get a usable CalendarView.

Note that this breaks on Android 4.x. On these devices CalendarView is
implemented using a ListView, which for some reason isn't given
any space during layouting - this results in the actual days in the month
being hidden (we do however see the weekday titles / month title).

MozReview-Commit-ID: wHNx1xG3JK

--HG--
extra : rebase_source : 6eb01c3cd4d9a38d7df516875201ab1eea265828
extra : histedit_source : c99960cd21663875f826894433ba57d99cf0facd

mobile/android/base/java/org/mozilla/gecko/widget/DateTimePicker.java

@@ -322,8 +322,6 @@ public class DateTimePicker extends FrameLayout {
             mCalendar = new CalendarView(context);
             mCalendar.setVisibility(GONE);
 
-            LayoutParams layoutParams = new LayoutParams(250, 280);
-            mCalendar.setLayoutParams(layoutParams);
             mCalendar.setFocusable(true);
             mCalendar.setFocusableInTouchMode(true);
             mCalendar.setMaxDate(mMaxDate.getTimeInMillis());

mobile/android/base/resources/layout/datetime_picker.xml

@@ -25,7 +25,7 @@
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/datetime_picker"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_gravity="center_horizontal"
     android:orientation="vertical"