[Feed] Fix Nonsynthetic NotSynthetic typo

Feed should report NotSynthetic instead of Nonsynthetic.

Bug: 943833
Change-Id: I851d7e2c7f604812466ff1df61e1cb2d4bf518e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542961Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645327}

components/feed/core/feed_logging_metrics.cc

@@ -362,10 +362,10 @@ void FeedLoggingMetrics::OnTokenCompleted(bool was_synthetic,
         token_count, kMaxTokenCount);
   } else {
     UMA_HISTOGRAM_EXACT_LINEAR(
-        "ContentSuggestions.Feed.TokenCompleted.ContentCount2.Nonsynthetic",
+        "ContentSuggestions.Feed.TokenCompleted.ContentCount2.NotSynthetic",
         content_count, kMaxContentCount);
     UMA_HISTOGRAM_EXACT_LINEAR(
-        "ContentSuggestions.Feed.TokenCompleted.TokenCount.Nonsynthetic",
+        "ContentSuggestions.Feed.TokenCompleted.TokenCount.NotSynthetic",
         token_count, kMaxTokenCount);
   }
 }
@@ -378,7 +378,7 @@ void FeedLoggingMetrics::OnTokenFailedToComplete(bool was_synthetic,
         failure_count, kMaxFailureCount);
   } else {
     UMA_HISTOGRAM_EXACT_LINEAR(
-        "ContentSuggestions.Feed.TokenFailedToCompleted.Nonsynthetic",
+        "ContentSuggestions.Feed.TokenFailedToCompleted.NotSynthetic",
         failure_count, kMaxFailureCount);
   }
 }