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This reverts commit de7cd485.

Reason for revert: Fixing issue with Mac tests.

Original change's description:
> Revert "Make PWA titlebar and icons flex and animate properly."
> 
> This reverts commit 8f2f4243.
> 
> Reason for revert: speculative revert for test failures on Mac
> for WebAppFrameToolbarBrowserTest.SpaceConstrained, see e.g.
> https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests/31700
> 
> Original change's description:
> > Make PWA titlebar and icons flex and animate properly.
> > 
> > Nested layouts now allocate available space properly to their
> > descendents. Also, we consistently use flex layout in the PWA titlebar.
> > 
> > Removed a couple of invalid assumptions that were encoded as DCHECKs.
> > 
> > There are still some inkdrop issues but they are purely cosmetic, see
> > crbug.com/1006162 for more detail.
> > 
> > Bug: 1048061
> > Change-Id: I403b71b5e2bbcb2d461e1ed6c543c76f91d4c652
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036264
> > Commit-Queue: Dana Fried <dfried@chromium.org>
> > Reviewed-by: Peter Boström <pbos@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#738874}
> 
> TBR=pbos@chromium.org,dfried@chromium.org
> 
> Change-Id: I731bad118043652a6dbd082c6099ebbd0c697835
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 1048061
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041615
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Commit-Queue: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#738907}

TBR=pbos@chromium.org,mastiz@chromium.org,dfried@chromium.org

Change-Id: Idb9712d1ffe45bf374af846278e26d61983a44f0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1048061
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042326Reviewed-by: Dana Fried <dfried@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742203}