Backed out 7 changesets (bug 1047483, bug 1079301, bug 1079335) for webplatform test failures.

Backed out changeset 7d06b68c44d0 (bug 1079335)
Backed out changeset 92030169528e (bug 1079301)
Backed out changeset c09d7f95554a (bug 1047483)
Backed out changeset c199f1057d7e (bug 1047483)
Backed out changeset 18830d07884c (bug 1047483)
Backed out changeset e087289ccfbb (bug 1047483)
Backed out changeset 6238ff5d3ed0 (bug 1047483)

CLOSED TREE

--HG--
rename : content/base/public/File.h => content/base/public/nsDOMFile.h
rename : content/base/src/MultipartFileImpl.cpp => content/base/src/nsDOMBlobBuilder.cpp
rename : content/base/src/MultipartFileImpl.h => content/base/src/nsDOMBlobBuilder.h
rename : content/base/src/File.cpp => content/base/src/nsDOMFile.cpp