Revert 240566 "[rAC, OSX] Force better initial size for sign-in"

Broke AutofillDialogControllerTest.SignInWebViewOpensLinksInNewTab

ASSERTION FAILED: !enable || !minSize.isEmpty()
  ../../third_party/WebKit/Source/core/frame/FrameView.cpp(3065) : void WebCore::FrameView::enableAutoSizeMode(bool, const WebCore::IntSize &, const WebCore::IntSize &)

> [rAC, OSX] Force better initial size for sign-in
> 
> Open the sign-in dialog with an initial size equal to the current
> dialog. This avoids one unnecessary resize until the content is loaded
> and makes the visual experience less jarring.
> 
> BUG=325518
> R=isherman@chromium.org
> 
> Review URL: https://codereview.chromium.org/103853004

TBR=groby@chromium.org

Review URL: https://codereview.chromium.org/113913008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240603 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240603