Bug 1150742 - Rename new_tablet_nav_back -> tabs_panel_nav_back. r=mhaigh

--HG--
rename : mobile/android/base/resources/drawable-large-hdpi-v11/new_tablet_nav_back.png => mobile/android/base/resources/drawable-large-hdpi-v11/tabs_panel_nav_back.png
rename : mobile/android/base/resources/drawable-large-xhdpi-v11/new_tablet_nav_back.png => mobile/android/base/resources/drawable-large-xhdpi-v11/tabs_panel_nav_back.png
rename : mobile/android/base/resources/drawable-large-xxhdpi-v11/new_tablet_nav_back.png => mobile/android/base/resources/drawable-large-xxhdpi-v11/tabs_panel_nav_back.png
extra : commitid : DqOh22ZJjDV
extra : rebase_source : 14cc7c56fba4a3c5f3fb6ffcf4c412075386d9bd

mobile/android/base/resources/layout-large-v11/new_tablet_tabs_panel_back_button.xml

@@ -9,7 +9,7 @@
                                            android:layout_width="@dimen/tabs_panel_button_width"
                                            android:layout_height="match_parent"
                                            android:minWidth="@dimen/tabs_panel_button_width"
-                                           android:src="@drawable/new_tablet_nav_back"
+                                           android:src="@drawable/tabs_panel_nav_back"
                                            android:contentDescription="@string/back"
                                            android:background="@drawable/action_bar_button_inverse"
                                            gecko:dividerVerticalPadding="@dimen/new_tablet_tab_panel_divider_vertical_padding"