Chrome 69

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1. install an extension with a dark-colored popup
   (for example test-ext attached below)
2. click the extension icon to open its popup

Expected: thin 2px borders on top and bottom or no borders at all
Observed: thick 4px borders on top and bottom

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Optional step:
3. open chrome://flags/#top-chrome-md
   set its value to "refresh"
   repeat steps 1-2
Observed: SUPER T H I C C 8px borders on top and bottom

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The problem here is that these borders are always white and the extension authors can't change their color so the disjointed parts of the popup frame look weird and too prominent when the popup background is dark. 

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Bisected to 8cd88c77b560468f1d41938f8d653fd0a22c4232
"Update shadows for bubbles and dialogs for Refresh"
Landed in 69.0.3446.0

    >This patch also gives bubbles and dialogs a corner radius and elevation
    >pre-Refresh. This will cause a small visual change.
 

Deleted: test-ext.zip 529 bytes

test-ext.zip 529 bytes Download

Deleted: 2px expected.png 1.9 KB

	2px expected.png 1.9 KB View Download

Deleted: 4px observed - standard top-ui.png 16.9 KB

	4px observed - standard top-ui.png 16.9 KB View Download

Deleted: 8px observed - refresh top-ui.png 4.9 KB

	8px observed - refresh top-ui.png 4.9 KB View Download