Revert of cc: Add image decode queue functionality to image manager.

cc/raster/task.cc

Index: cc/raster/task.cc
diff --git a/cc/raster/task.cc b/cc/raster/task.cc
index 94486fd523a41812647ec939fcf0c0d6e27c7f78..94e413f46d8cbf6df6d1631aaca7e3ab51d9a381 100644
--- a/cc/raster/task.cc
+++ b/cc/raster/task.cc
@@ -18,10 +18,6 @@
          "CANCELED state.";
 }
 
-bool TaskState::IsNew() const {
-  return value_ == Value::NEW;
-}
-
 bool TaskState::IsScheduled() const {
   return value_ == Value::SCHEDULED;
 }
@@ -40,23 +36,6 @@
 
 void TaskState::Reset() {
   value_ = Value::NEW;
-}
-
-std::string TaskState::ToString() const {
-  switch (value_) {
-    case Value::NEW:
-      return "NEW";
-    case Value::SCHEDULED:
-      return "SCHEDULED";
-    case Value::RUNNING:
-      return "RUNNING";
-    case Value::FINISHED:
-      return "FINISHED";
-    case Value::CANCELED:
-      return "CANCELED";
-  }
-  NOTREACHED();
-  return "";
 }
 
 void TaskState::DidSchedule() {