fix various NPEs

    Bugs: 4597115
    	  4580514
	  4580511
	  4560889
	  4545346

    Monkey proofing nav screen;
    disabled pause/resume during scroll

Change-Id: I4e24b91fc0b6c008cb4e2df113316c0063f0c915
diff --git a/src/com/android/browser/NavTabScroller.java b/src/com/android/browser/NavTabScroller.java
index bd26df7..312e2b8 100644
--- a/src/com/android/browser/NavTabScroller.java
+++ b/src/com/android/browser/NavTabScroller.java
@@ -197,17 +197,7 @@
                 int bottom = child.getBottom();
                 if (top <= midy && bottom >= midy) {
                     sel = i;
-                } else {
-                    // check if on screen
-                    if (top > getScrollY() + getHeight() || bottom < getScrollY()) {
-                        if (!child.isPaused()) {
-                            child.pause();
-                        }
-                    } else {
-                        if (child.isPaused()) {
-                            child.resume();
-                        }
-                    }
+                    break;
                 }
             }
             if (sel != -1) {
diff --git a/src/com/android/browser/NavTabView.java b/src/com/android/browser/NavTabView.java
index 061e024..f170b0f 100644
--- a/src/com/android/browser/NavTabView.java
+++ b/src/com/android/browser/NavTabView.java
@@ -198,7 +198,9 @@
 
     @Override
     public void onDetachedFromWindow() {
-        mWebView.setProxyView(null);
+        if (mWebView != null) {
+            mWebView.setProxyView(null);
+        }
     }
 
     private static void removeFromParent(View v) {
diff --git a/src/com/android/browser/TabControl.java b/src/com/android/browser/TabControl.java
index 0aaf3d6..1e21431 100644
--- a/src/com/android/browser/TabControl.java
+++ b/src/com/android/browser/TabControl.java
@@ -286,7 +286,11 @@
             }
         }
         outState.putLongArray(POSITIONS, ids);
-        final long cid = getCurrentTab().getId();
+        Tab current = getCurrentTab();
+        long cid = -1;
+        if (current != null) {
+            cid = current.getId();
+        }
         outState.putLong(CURRENT, cid);
     }