Single word keywords does not increase purchase intent when searching

[btlechowski]

Follow up to #8047

Searching for audi does not increase purchase intent

Steps to Reproduce

1. Clean profile
2. Connect to US
3. Run Brave with command line: /usr/bin/brave-browser --enable-logging=stderr --vmodule=brave_ads=3 --brave-ads-staging --rewards=staging=true
4. Enable Rewards
5. Search for audi in URL bar

Actual result:

purchase intent weight is not increased
automotive purchase intent by make-audi in Default/ads_service/client.json is empty or doesn't exists

Expected result:

purchase intent weight is increased
automotive purchase intent by make-audi in Default/ads_service/client.json is not empty and contains one element

Reproduces how often:

100% repro rate

Brave version (brave://version info)

Brave	1.7.78 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Ubuntu 18.04 LTS

cc @brave/legacy_qa @rebron @tmancey @moritzhaller

[btlechowski]

@moritzhaller Is this PR merged in 1.9.x? Can you double check?

The issue is still reproducible on

Brave	1.9.55 Chromium: 81.0.4044.129 (Official Build) dev (64-bit)
Revision	3d71af9f5704a40b85806f4d08925db24605ba25-refs/branch-heads/4044@{#979}
OS	Linux

[moritzhaller]

@moritzhaller Is this PR merged in 1.9.x? Can you double check?

@btlechowski apologies, I tagged the wrong release it should be in 1.10.x!

[btlechowski]

Changed the milestone to 1.10.x

[btlechowski]

Verification passed on

Brave	1.10.74 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
Revision	8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#5182

Searched for audi

"purchaseIntentSignalHistory": {
	"automotive purchase intent by make-audi": [{
			"timestamp_in_seconds": 1590649595,
			"weight": 1
		}
	]
},

Searched for acura

"automotive purchase intent by make-acura": [{
		"timestamp_in_seconds": 1590649955,
		"weight": 1
	}
],

Verification passed on

Brave | 1.10.74 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | Windows 10 OS Version 1803 (Build 17134.1006)

• Verified test plan from Fix Single word keywords does not increase purchase intent when searching brave-core#5182

Searched for audi

"purchaseIntentSignalHistory": {
    "automotive purchase intent by make-audi": [
      {
        "timestamp_in_seconds": 1590663220,
        "weight": 1
      }
    ]
  },

---

Verified passed with

Brave | 1.10.79 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | macOS Version 10.14.6 (Build 18G3020)

• Verified test plan from Fix Single word keywords does not increase purchase intent when searching brave-core#5182

  "purchaseIntentSignalHistory": {
    "automotive purchase intent by make-audi": [
      {
        "timestamp_in_seconds": 1591039915,
        "weight": 1
      }
    ]
  },