Using navigation bar height to request transparent region during translateTitleBar

After pageload the titlebar is somehow getting an incorrect height causing the
requestTransparentRegion to not getting executed. Hence using the navigation bar height
instead

Change-Id: Icac0ff4b0b2a5ab53fda64795279e22c29547387
diff --git a/src/com/android/browser/BaseUi.java b/src/com/android/browser/BaseUi.java
index 4c17b8b..f771ca1 100644
--- a/src/com/android/browser/BaseUi.java
+++ b/src/com/android/browser/BaseUi.java
@@ -840,7 +840,7 @@
             }
             if (!mTitleBar.isFixed()) {
                 float currentY = mTitleBar.getTranslationY();
-                float height = mTitleBar.getHeight();
+                float height = mNavigationBar.getHeight();
                 if ((height + currentY) <= 0 && (height + topControlsOffsetYPix) > 0) {
                     mTitleBar.requestLayout();
                 } else if ((height + topControlsOffsetYPix) <= 0) {