Remove expectations / -r from DM entirely.

dm/DMExpectationsTask.cpp

Index: dm/DMExpectationsTask.cpp
diff --git a/dm/DMExpectationsTask.cpp b/dm/DMExpectationsTask.cpp
deleted file mode 100644
index e29257afbd96c7efbb38e3fdca76fe9d0ae9b598..0000000000000000000000000000000000000000
--- a/dm/DMExpectationsTask.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#include "DMExpectationsTask.h"
-#include "DMUtil.h"
-
-namespace DM {
-
-ExpectationsTask::ExpectationsTask(const Task& parent,
-                                   const Expectations& expectations,
-                                   SkBitmap bitmap)
-    : CpuTask(parent)
-    , fName(parent.name())  // Masquerade as parent so failures are attributed to it.
-    , fExpectations(expectations)
-    , fBitmap(bitmap)
-    {}
-
-void ExpectationsTask::draw() {
-    if (!fExpectations.check(*this, fBitmap)) {
-        this->fail();
-    }
-}
-
-}  // namespace DM