fix add tab asset for different dpis

Change-Id: Ifd2413877ad4f9e60a82cda1759694d6bd36fcfc
diff --git a/res/drawable-hdpi/browsertab_add.png b/res/drawable-hdpi/browsertab_add.png
index 1e52bb1..7401eed 100644
--- a/res/drawable-hdpi/browsertab_add.png
+++ b/res/drawable-hdpi/browsertab_add.png
Binary files differ
diff --git a/res/drawable-xhdpi/browsertab_add.png b/res/drawable-xhdpi/browsertab_add.png
index e44f72b..ef7603e 100644
--- a/res/drawable-xhdpi/browsertab_add.png
+++ b/res/drawable-xhdpi/browsertab_add.png
Binary files differ