Revert "migrating SkTDArray towards std::vector api"

This reverts commit 79884be809e8041baf294137bd2018f2d6fe0f10.

Reason for revert: broke flutter build -- initializer_list?

Original change's description:
> migrating SkTDArray towards std::vector api
> 
> push -> push_back
> add some aliases to match std::vector: count, reserve, ...
> 
> Bug: skia:
> Change-Id: I1921c31d0d6e5ed3d622a0def6054c697be2d02f
> Reviewed-on: https://skia-review.googlesource.com/145884
> Reviewed-by: Mike Klein <mtklein@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=mtklein@google.com,fmalita@chromium.org,reed@google.com

Change-Id: Ib6132b725aaed7c01287e3e8c2b5a14da3d3d7e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/146140
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tools/flags/SkCommandLineFlags.cpp b/tools/flags/SkCommandLineFlags.cpp
index 3924812..8e38c52 100644
--- a/tools/flags/SkCommandLineFlags.cpp
+++ b/tools/flags/SkCommandLineFlags.cpp
@@ -253,7 +253,7 @@
                 SkTDArray<SkFlagInfo*> allFlags;
                 for (SkFlagInfo* flag = SkCommandLineFlags::gHead; flag;
                      flag = flag->next()) {
-                    allFlags.push_back(flag);
+                    allFlags.push(flag);
                 }
                 SkTQSort(&allFlags[0], &allFlags[allFlags.count() - 1],
                          CompareFlagsByName());