Compile-fix for mac.

Add a #include for SharedBuffer.h to CachedImage.cpp, which apparently didn't
get it in the switch from ResourceBuffer to SharedBuffer.

BUG=none
TEST=none
TBR=abarth

Review URL: https://codereview.chromium.org/14267006

git-svn-id: svn://svn.chromium.org/blink/trunk@148686 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed