Reduce adblock filter memory usage by optimizing unused regex rules

[antonok-edm]

As discovered by @atuchin-m, there is an extra ~7MB that can be saved by optimizing the regex field of NetworkFilter in adblock-rust. This was fixed in adblock-rust as of v0.5.2.

[atuchin-m]

For QA: we should verify, that browser process memory consumption became 7mb less.
A possible scenario:

1. Launch browser without the fix with one saved tab about:blank
2. Wait 15 sec.
3. Check browser process memory footprint in the internal task manager (see a screenshot)
4. Repeat a few times to make the results stable (3-5 times)
5. Repeat 1-4 for browser with the fix

[MadhaviSeelam]

Verified PASSED with

Brave	1.39.86 Chromium: 101.0.4951.41 (Official Build) beta (64-bit)
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	Windows 11 Version 21H2 (Build 22000.613)

Below builds do not have fix

Brave	1.38.109 Chromium: 101.0.4951.41 (Official Build) (64-bit)
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	Windows 11 Version 21H2 (Build 22000.613)

And

Brave	1.37.105 Chromium: 100.0.4896.46 (Official Build) (64-bit)
Revision	5ca33821b2211805855c77d334353d27c616a7ca-refs/branch-heads/4896@{#584}
OS	Windows 11 Version 21H2 (Build 22000.613)

Verified test plan from #21970 (comment).

Compared browser memory consumption on 1.39.86 to 1.38.109 and 1.37.105 and consumption is significantly less in Beta.

1.39.86 Chromium: 101.0.4951.41

ex1	ex2	ex3	ex4	ex5

1.38.109 Chromium: 101.0.4951.41

ex1	ex2	ex3	ex4	ex5

[LaurenWags]

Verified with

Brave | 1.39.87 Chromium: 101.0.4951.41 (Official Build) beta (x86_64)
-- | --
Revision | 93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS | macOS Version 12.3.1 (Build 21E258)

Verified test plan from #21970 (comment).

Compared 1.38.109 (current Release channel version) and 1.39.87 (current Beta channel version).
Browser memory footprint was decreased in 1.39.x.

1.38.109	1.39.87

Brave	1.39.84 Chromium: 101.0.4951.41 (Official Build) beta (arm64) 
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	macOS Version 12.3.1 (Build 21E258)

Verified test plan from #21970 (comment).

Compared 1.38.109 (current Release channel version) and 1.39.84 (recent Beta channel version).
Browser memory footprint was decreased in 1.39.x.

1.38.109	1.39.84

Brave	1.39.87 Chromium: 101.0.4951.41 (Official Build) beta (x86_64) 
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	macOS Version 10.15.7 (Build 19H1824)

Verified test plan from #21970 (comment).

Compared 1.38.109 (current Release channel version) and 1.39.87 (current Beta channel version).
Browser memory footprint was decreased in 1.39.x.

1.38.109	1.39.87

[stephendonner]

Verified PASSED using

Brave	1.39.87 Chromium: 101.0.4951.41 (Official Build) beta (x86_64)
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	macOS Version 11.6.5 (Build 20G527)

to compare against

Brave	1.38.109 Chromium: 101.0.4951.41 (Official Build) (x86_64)
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	macOS Version 11.6.5 (Build 20G527)

Confirmed, for my setup, that we dropped around 15MB in resident-set-size, on average.

Build	Median
1.38.109	120 (120.4)
1.39.87	105 (105.4)

Breakdown:

1.38.109 (in MB)	1.39.87 (in MB)
119	110
121	105
119	105
124	103
119	104

---

Verified PASSED using

Brave	1.39.84 Chromium: 101.0.4951.41 (Official Build) beta (arm64)
Revision	93c720db8323b3ec10d056025ab95c23a31997c9-refs/branch-heads/4951@{#904}
OS	macOS Version 11.6.4 (Build 20G417)

Confirmed, for my setup, that we dropped around 114MB in resident-set-size, on average.

Build	Median
1.38.109	113 (113.2)
1.39.84	** 99 (98.98)**

Breakdown:

1.38.109 (in MB)	1.39.84 (in MB)
116	101
113	101
112	95.1
112	96.8
113	101

[btlechowski]

Verification passed on

Brave	1.39.100 Chromium: 101.0.4951.61 (Official Build) beta (64-bit)
Revision	3b3633b32c491b4cba5fd7df3c7c0f628547cbcc-refs/branch-heads/4951@{#1189}
OS	Ubuntu 18.04 LTS

On 5 point average, 1.39.x uses 8MB less memory

Example 1.38.x:

Example 1.39.x

[kjozwiak]

Verification PASSED on Samsung S10+ running Android 12 using the following build(s):

Brave | 1.39.111 Chromium: 102.0.5005.61 (Official Build) (64-bit)
--- | ---
Revision | 0e59bcc00cc4985ce39ad31c150065f159d95ad3-refs/branch-heads/5005@{#819}
OS | Android 12; Build/SP1A.210812.016

1.38.119 (370.2 MB)	1.38.119 (318 MB)	1.38.119 (304.5 MB)	1.38.119 (302.4 MB)	1.38.119 (316.2 MB)

1.39.111 (310.6 MB)	1.39.111 (314 MB)	1.39.111 (312 MB)	1.39.111 (297.7 MB)	1.39.111 (308.3 MB)

---

Verification PASSED on Samsung Galaxy Tablet A running Android 11 using the following build(s):

Brave | 1.39.111 Chromium: 102.0.5005.61 (Official Build) (64-bit)
--- | ---
Revision | 0e59bcc00cc4985ce39ad31c150065f159d95ad3-refs/branch-heads/5005@{#819}
OS | Android 11; Build/RP1A.200720.012

1.38.119 (214.3 MB)	1.38.119 (176.2 MB)	1.38.119 (232.6 MB)	1.38.119 (204.4 MB)	1.38.119 (202.4 MB)

1.39.111 (154 MB)	1.39.111 (177.6 MB)	1.39.111 (161.4 MB)	1.39.111 (160.9 MB)	1.39.111 (149.5 MB)