Try to fix Crash at gfx::CGImageToSkBitmap.
Try to fix Crash at gfx::CGImageToSkBitmap.

The fix is to add the check for NULL context since skia::BitmapPlatformDevice::Create might return NULL.

BUG=54880
TEST=none

Review URL: http://codereview.chromium.org/3352014

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@58952 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser