Remove most of scoped styles.

LayoutTests/fast/css/style-scoped/style-scoped-with-important-rule-expected.txt

-CONSOLE WARNING: 'ShadowRoot.applyAuthorStyles' is deprecated.
-Test that rules in an inner scoped stylesheet don't override !important rules declared in an outer scoped stylesheet.
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-Case1: The target element has any matched important rule declared in an outer scoped stylesheet, and the element also has any matched normal rule declared in an inner scoped stylesheet.
-PASS getComputedStyle(target1).borderColor is "rgb(0, 128, 0)"
-Case2: The target element has any matched important rule declared in an outer scoped stylesheet, and the element also has a matched normal ID rule declared in an inner scoped stylesheet.
-PASS getComputedStyle(target2).borderColor is "rgb(0, 128, 0)"
-Case3: The target element has any matched important rule declared in an outer scoped stylesheet, and the element also has matched normal rules declared in an inner scoped stylesheet and in a STYLE attribute.
-PASS getComputedStyle(target3).borderColor is "rgb(0, 128, 0)"
-Case4: The target element has matched important rules. One is declared in an outer scoped stylesheet and the other is declared in an inner scoped stylesheet.
-PASS getComputedStyle(target4).borderColor is "rgb(0, 0, 255)"
-Case5: The target element has any matched important rule declared in an author stylesheet, and the element also has matched normal rules declared in an inner scoped stylesheet.
-PASS getComputedStyle(target5).borderColor is "rgb(0, 255, 0)"
-Case6: The target element has matched important rules. One is declared in an author stylesheet (not scoped) and the other is declared in a scoped stylesheet.
-PASS getComputedStyle(target6).borderColor is "rgb(0, 0, 255)"
-Case7: The target element has any matched important rule declared in an outer scoped stylesheet. The element is in a shadow dom tree whose shadow root has apply-author-styles true. The shadow dom tree has any other normal rules which match the element.
-PASS getComputedStyle(target7).borderColor is "rgb(0, 128, 0)"
-Case8: The target element in a shadow dom tree has any matched important rule declared in an outer scoped stylesheet in an enclosing shadow dom tree. The target element's shadow root has apply-author-styles true.
-PASS getComputedStyle(target8).borderColor is "rgb(0, 128, 0)"
-Case8': The target element is in a shadow dom tree. An enclosing shadow dom tree has some stylesheet which declares an important rule. The target element's shadow root has apply-author-styles false.
-PASS getComputedStyle(target8).borderColor is "rgb(0, 0, 255)"
-PASS successfullyParsed is true
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-TEST COMPLETE
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