Revert "Remove navigator.deviceMemory (part 1)" (uplift to 1.16.x)

[brave-builds]

Uplift of #6965 to fix brave/brave-browser#12289.

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

@fmarier not sure if we're going to be taking this as the issue doesn't seem like it got better on Nightly but just in case, can you rebase the following PR now that #6963 landed in 1.17.x & 1.16.x via #6971 & #6970.

[kjozwiak]

Restarting Win x64 via https://ci.brave.com/job/brave-core-build-pr-windows/job/PR-6969/3/ as our Agent was removed as per https://ci.brave.com/job/pr-brave-browser-pr6965_francois-recaptcha-12289_1.16.x-windows/2/execution/node/189/log/

14:02:05  Cannot contact i-022f52f555dc6c2a4-windows-swarm-2a9a8768: hudson.remoting.RequestAbortedException: java.nio.channels.ClosedChannelException
14:07:05  Could not connect to i-022f52f555dc6c2a4-windows-swarm-2a9a8768 to send interrupt signal to process

Restarting macOS via https://ci.brave.com/job/pr-brave-browser-pr6965_francois-recaptcha-12289_1.16.x-macos/3/ as init and build failed as per https://ci.brave.com/job/pr-brave-browser-pr6965_francois-recaptcha-12289_1.16.x-macos/2/execution/node/213/log/

14:26:28  FAILED: obj/content/browser/browser/browser_main_loop.o 

[kjozwiak]

macOS failed tets-browser due to RewardsContributionBrowserTest.RecurringAndPartialAutoContribution failing as per https://ci.brave.com/job/pr-brave-browser-pr6965_francois-recaptcha-12289_1.16.x-macos/3/execution/node/249/log. However, the failure is a known intermittent issue and doesn't block uplift.

12:03:33  1 test crashed:
12:03:33      RewardsContributionBrowserTest.RecurringAndPartialAutoContribution (../../brave/components/brave_rewards/browser/test/rewards_contribution_browsertest.cc:620)

[kjozwiak]

Uplift into 1.16.x approved after deliberating with @brave/uplift-approvers. QA has verified the PR on Nightly as per #6965 (comment).