Explicitly set theme to all activities.

The default theme change to Holo caused a crash in MessageCompose,
because Holo has actionbar, which MessageCompose doesn't expect at
this point.  Explicitly set theme to prevent crashes.

Bug 2945294.

Change-Id: Ic5f833690eeb1048e8c4c3ac7a42c2d454c61876
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 31863e3..fa13b39 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -56,8 +56,16 @@
                 android:description="@string/permission_access_provider_desc"/>
     <uses-permission android:name="com.android.email.permission.ACCESS_PROVIDER"/>
 
+    <!--
+      Regarding android:theme
+      Some of the activities can't handle ActionBar, which comes with the new
+      default theme "Holo".  Explicitly set the traditional default theme.
+      TODO This should go away.  (Or make Light.Holo default)
+    -->
     <application android:icon="@drawable/icon" android:label="@string/app_name"
-        android:name="Email">
+        android:name="Email"
+        android:theme="@android:style/Theme"
+        >
         <activity
             android:name=".activity.Welcome"
             android:theme="@android:style/Theme.WithActionBar" >