Fixes OOM bitmap crash.

Change-Id: Ied0293b7f1dbfe16c3517dbb9e2b19c8030d31a5
diff --git a/src/com/android/browser/PhoneUi.java b/src/com/android/browser/PhoneUi.java
index b5d0a38..7ae9bf7 100644
--- a/src/com/android/browser/PhoneUi.java
+++ b/src/com/android/browser/PhoneUi.java
@@ -572,6 +572,10 @@
             mTitle.setImageBitmap(mTitleBarBitmap);
             mTitle.setVisibility(View.VISIBLE);
             // SWE: WebView.draw() wouldn't draw anything if SurfaceView is enabled.
+            if (mContentBitmap != null) {
+                mContentBitmap.recycle();
+                mContentBitmap = null;
+            }
             mContentBitmap = web.getViewportBitmap();
             if (mContentBitmap == null) {
                 int h = web.getHeight() - embTbarHeight;