[Android] Do not clear url bar text on focus

[samartnik]

Resolves brave/brave-browser#10524

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[SergeyZhukovsky]

++

[samartnik]

Currently on long urls it shows the end part of it. The same behavior the we have when click edit button. @jumde is it ok from security stand point?

[samartnik]

CI failed on audit_deps, not related to this PR

[jumde]

@samartnik - This is the behavior on iOS: brave/brave-ios#552 (comment) - We should do the same on android.

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.13.10 x64 nightly build

• Verified test plan from Handling truncated domains brave-ios#552 (comment)
• Logged follow up issue as an enhancement for Android mobile [Android] Show complete eTDL+1 in URL display modal  brave-browser#10723

---

Verification passed on Samsung Tab A with Android 9 running 1.13.10 x64 nightly build

• Verified test plan from Handling truncated domains brave-ios#552 (comment)