feat(connectOverCDP): add noDefaults option

[sidsarasvati]

Closes #40158

Adds a noDefaults option to connectOverCDP that skips the default overrides Playwright applies to the attached browser. When true, the default context will not receive:

• Browser.setDownloadBehavior
• Emulation.setFocusEmulationEnabled
• Emulation.setEmulatedMedia

New contexts created via browser.newContext() are not affected.

const browser = await chromium.connectOverCDP('http://localhost:9222', {
  noDefaults: true,
});

[sidsarasvati]

@microsoft-github-policy-service agree

[yury-s]

Please rebase and we can merge it.

[sidsarasvati]

Please rebase and we can merge it.

Rebased onto main. Thanks!

[yury-s]

@microsoft-github-policy-service rerun

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[github-actions]

Test results for "MCP"

2 failed
❌ [chromium] › mcp/dashboard.spec.ts:34 › should show devtools sidebar @mcp-macos-latest
❌ [webkit] › mcp/cli-test.spec.ts:23 › debug test and snapshot @mcp-macos-latest

6042 passed, 976 skipped

---

Merge workflow run.

[github-actions]

Test results for "tests 1"

2 failed
❌ [webkit-library] › library/locator-highlight.spec.ts:21 › highlight should accept a CSS string style @webkit-ubuntu-22.04-node20
❌ [webkit-library] › library/locator-highlight.spec.ts:40 › highlight should accept an object style (JS only) @webkit-ubuntu-22.04-node20

3 flaky

⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1080 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-page] › page/page-wait-for-function.spec.ts:104 › should work with strict CSP policy `@firefox-ubuntu-22.04-node20`

39183 passed, 847 skipped

---

Merge workflow run.

[yury-s]

@sidsarasvati please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

@sidsarasvati looks like the license/cla bot didn't catch your message, can you accept it again?