migrating SkTDArray towards std::vector api

fix for https://skia-review.googlesource.com/c/skia/+/146140

Change from original was to include <initializer_list>

Bug: skia:
Change-Id: Ie36426fcf7ce778a95e2b656ce80a9a394a8307c
Reviewed-on: https://skia-review.googlesource.com/146160
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/src/pdf/SkPDFDocument.cpp b/src/pdf/SkPDFDocument.cpp
index 7d91454..ace2f45 100644
--- a/src/pdf/SkPDFDocument.cpp
+++ b/src/pdf/SkPDFDocument.cpp
@@ -61,7 +61,7 @@
         // always free and has a generation number of 65,535; it is
         // the head of the linked list of free objects."
         SkASSERT(fOffsets.count() == fNextToBeSerialized);
-        fOffsets.push(this->offset(wStream));
+        fOffsets.push_back(this->offset(wStream));
         wStream->writeDecAsText(index);
         wStream->writeText(" 0 obj\n");  // Generation number is always 0.
         object->emitObject(wStream, fObjNumMap);