DevTools Slow down when there are reachable breakpoints

[stagefright5]

Description

Breakpoints while debugging in the devTools window extremely slows down the browser.

Steps to Reproduce

1. Run any web app
2. open devtools (ctrl+shift+I)
3. Put a breakpoint in the .js file of the app, where the control is guaranteed to enter

Actual result:

Slows down the browser

Expected result:

Should not slowdown the browser

Reproduces how often:

Easily Repoduced

Brave version (brave://version info)

Brave	1.1.20 Chromium: 79.0.3945.74 (Official Build) (64-bit)
Revision	99b6d241cf84f7fa7434ae8a59f9e74eb1464280-refs/branch-heads/3945@{#888}
OS	Linux
JavaScript	V8 7.9.317.29
Flash	(Disabled)

Version/Channel Information:

• Can you reproduce this issue with the current release?
  Yes
• Can you reproduce this issue with the beta channel?
  Not Sure
• Can you reproduce this issue with the dev channel?
  Not Sure
• Can you reproduce this issue with the nightly channel?
  Not Sure

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
  No
• Does the issue resolve itself when disabling Brave Rewards?
  No
• Is the issue reproducible on the latest version of Chrome?
  No

Miscellaneous Information: