Backed out 4 changesets (bug 982726) for mochitest-4 bustage

Backed out changeset 547076d4a357 (bug 982726)
Backed out changeset 095ca68e5d38 (bug 982726)
Backed out changeset 05acfcc7a341 (bug 982726)
Backed out changeset 9244a16c3258 (bug 982726)
Bug 1061241 - Unref our LocalMatrixShader when building our mask SkPaint r=mattwoodrow