[DO NOT MERGE] Address some spacing issues in all apps related to new support library

issue 27581978

Change-Id: If7a1ea19aa586bb3de6bde960b16e59f86061227

res/layout/all_apps_empty_search.xml

@@ -16,7 +16,7 @@
 <TextView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/empty_text"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:gravity="start"
     android:paddingTop="@dimen/all_apps_empty_search_message_top_offset"

res/layout/all_apps_icon.xml

@@ -18,7 +18,7 @@
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
     style="@style/Icon.AllApps"
     android:id="@+id/icon"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_gravity="center"
     android:paddingTop="@dimen/all_apps_icon_top_bottom_padding"

res/layout/all_apps_prediction_bar_icon.xml

@@ -18,7 +18,7 @@
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
     style="@style/Icon.AllApps"
     android:id="@+id/icon"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_gravity="center"
     android:paddingTop="@dimen/all_apps_prediction_icon_top_padding"

res/layout/all_apps_search_market.xml

@@ -16,7 +16,7 @@
 <TextView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/search_market_text"
-    android:layout_width="wrap_content"
+    android:layout_width="match_parent"
     android:layout_height="48dp"
     android:gravity="start|center_vertical"
     android:paddingLeft="16dp"