Rename the TextDialog to WebTextView.

Rename the TextDialog to be a more accurate description of what it is.
Also rename some methods and variables which pertain to it, and preload
the newly created class.
diff --git a/preloaded-classes b/preloaded-classes
index 8ee015f..3858883 100644
--- a/preloaded-classes
+++ b/preloaded-classes
@@ -485,7 +485,6 @@
 android.webkit.JWebCoreJavaBridge
 android.webkit.LoadListener
 android.webkit.MimeTypeMap
-android.webkit.TextDialog
 android.webkit.URLUtil
 android.webkit.WebBackForwardList
 android.webkit.WebHistoryItem
@@ -501,6 +500,7 @@
 android.webkit.WebSettings$TextSize
 android.webkit.WebSyncManager
 android.webkit.WebSyncManager$SyncHandler
+android.webkit.WebTextView
 android.webkit.WebView
 android.webkit.WebView$ExtendedZoomControls
 android.webkit.WebView$PrivateHandler