Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

src/core/SkReadBuffer.cpp

Index: src/core/SkReadBuffer.cpp
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index d016d9c980b5ecbc77fc938a059c0cea11add3dc..c32c7bd658672b3531900f3484363251223f91e1 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -335,3 +335,25 @@ SkFlattenable* SkReadBuffer::readFlattenable(SkFlattenable::Type ft) {
     }
     return obj;
 }
+
+/**
+ *  Needs to follow the same pattern as readFlattenable(), but explicitly skip whatever data
+ *  has been written.
+ */
+void SkReadBuffer::skipFlattenable() {
+    if (fFactoryCount > 0) {
+        if (0 == fReader.readU32()) {
+            return;
+        }
+    } else if (fFactoryTDArray) {
+        if (0 == fReader.readU32()) {
+            return;
+        }
+    } else {
+        if (NULL == this->readFunctionPtr()) {
+            return;
+        }
+    }
+    uint32_t sizeRecorded = fReader.readU32();
+    fReader.skip(sizeRecorded);
+}