Start merging new-Blob.html and Blob-constructor.html.
Move tests for platform objects with indexed getters.
Also move the iframe for the indexed properties tests.
Move tests for platform array objects.
Move tests for the type argument.
Use the infrastructure from new-Blob.html for the existing type tests in Blob-constructor.html.
Move tests with real arrays.
Merge pull request #525 from Ms2ger/new-Blob

Start merging new-Blob.html and Blob-constructor.html; r=zcorpan