Revert of Consolidate SkStream copying methods

src/core/SkStream.cpp

Index: src/core/SkStream.cpp
diff --git a/src/core/SkStream.cpp b/src/core/SkStream.cpp
index 80628d452c79773515c2323f135f6e13aea98fb4..9529308e8689ff135aa77e24dddb7639ec97a812 100644
--- a/src/core/SkStream.cpp
+++ b/src/core/SkStream.cpp
@@ -890,9 +890,12 @@
     }
 
     SkDynamicMemoryWStream tempStream;
-    if (!SkStreamCopy(&tempStream, stream)) {
-        return nullptr;
-    }
+    const size_t bufferSize = 4096;
+    char buffer[bufferSize];
+    do {
+        size_t bytesRead = stream->read(buffer, bufferSize);
+        tempStream.write(buffer, bytesRead);
+    } while (!stream->isAtEnd());
     return tempStream.copyToData();
 }