Update pool dimension for "Mac 10.13 Laptop High End"

TBR=eyaich@chromium.org
NOTRY=true  # tests by PRESUMIT

Bug: 844502
Change-Id: I335e1f3b8ad43fd00bcb3057fe4bb0323fb7289d
Reviewed-on: https://chromium-review.googlesource.com/1073085Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#561819}

testing/buildbot/chromium.perf.fyi.json

@@ -474,7 +474,7 @@
             {
               "gpu": "1002:6821",
               "os": "Mac-10.13",
-              "pool": "Chrome-perf-fyi"
+              "pool": "chrome.tests.perf-fyi"
             }
           ],
           "expiration": 36000,
@@ -518,7 +518,7 @@
             {
               "gpu": "1002:6821",
               "os": "Mac-10.13",
-              "pool": "Chrome-perf-fyi"
+              "pool": "chrome.tests.perf-fyi"
             }
           ],
           "expiration": 36000,
@@ -559,7 +559,7 @@
             {
               "gpu": "1002:6821",
               "os": "Mac-10.13",
-              "pool": "Chrome-perf-fyi"
+              "pool": "chrome.tests.perf-fyi"
             }
           ],
           "expiration": 36000,

tools/perf/core/perf_data_generator.py

@@ -1038,7 +1038,7 @@ NEW_PERF_RECIPE_FYI_TESTERS = {
       ],
       'platform': 'mac',
       'dimension': {
-        'pool': 'Chrome-perf-fyi',
+        'pool': 'chrome.tests.perf-fyi',
         'os': 'Mac-10.13',
         'gpu': '1002:6821'
       },