Remove suppressions for bug 52808 (leak in HostContentSettingsMapTest.ResourceIdentifierPrefs)

tools/heapcheck/suppressions.txt

Index: tools/heapcheck/suppressions.txt
diff --git a/tools/heapcheck/suppressions.txt b/tools/heapcheck/suppressions.txt
index 57250afb6b443fd1fa65e9ca0ef360e9f0994abe..42cd4332686d7d33e5214292ce5d8b57c5ebc3e9 100644
--- a/tools/heapcheck/suppressions.txt
+++ b/tools/heapcheck/suppressions.txt
@@ -957,13 +957,3 @@
    fun:Callback1::Type* NewCallback
    fun:PrefValueStoreTest_TestConcurrentPolicyRefresh_Test::TestBody
 }
-{
-   bug_52808
-   Heapcheck:Leak
-   ...
-   fun:base::JSONReader::BuildValue
-   fun:base::JSONReader::JsonToValue
-   fun:base::JSONReader::ReadAndReturnError
-   fun:base::JSONReader::Read
-   fun:::HostContentSettingsMapTest_ResourceIdentifierPrefs_Test::TestBody
-}