Revert "Links and docs with just one image inside should get annotated."

This reverts commit b8da3f9a6fd6f77c140ddbcc8aa9244a1fbcf529.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 639835 as the
culprit for flakes in the build cycles as shown on:
https://analysis.chromium.org/p/chromium/flake-portal/analysis/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vYjhkYTNmOWE2ZmQ2Zjc3YzE0MGRkYmNjOGFhOTI0NGExZmJjZjUyOQw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.win/Win%207%20Tests%20x64%20%281%29/50176

Sample Failed Step: browser_tests

Sample Flaky Test: ImageAnnotationBrowserTest.ImagesInLinks

Original change's description:
> Links and docs with just one image inside should get annotated.
> 
> There were cases where no annotation was being read for an image
> inside of a link, depending on the exact syntax and the platform
> and screen reader. In addition, some screen readers weren't
> reading the image annotation when opening an image by itself in
> a tab.
> 
> Address both of these by having a rootWebArea or link get the
> annotation of its inner image, when it has exactly one inner
> image and no other text or object with a name inside.
> 
> Bug: 940043
> Change-Id: Ic3283e6f8ea26f1ec9ed1cb1203800cd44a49a00
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1512916
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Katie Dektar <katie@chromium.org>
> Reviewed-by: Nektarios Paisios <nektar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#639835}

Change-Id: I94a23c0db273b554ba2586d1a6165993faffb3fa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 940043
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1519933
Cr-Commit-Position: refs/heads/master@{#640194}
7 files changed