Fix a memory leak in ExtensionExtentUnittest by fixing a bad

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 3561 matching lines @@
    bug_47331_part_2
    Memcheck:Leak
    fun:malloc
    fun:malloc
    fun:sqlite3MemMalloc
    fun:mallocWithAlarm
    fun:sqlite3Malloc
    fun:sqlite3HashInsert
    fun:sqlite3EndTable
 }
-{
-   bug_47539
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN10URLPattern16CreateFromStringERKSs
-   fun:_ZN28ExtensionExtentTest_One_Test8TestBodyEv
-   fun:_ZN7testing4Test3RunEv
-   fun:_ZN7testing8internal12TestInfoImpl3RunEv
-   fun:_ZN7testing8TestCase3RunEv
-   fun:_ZN7testing8internal12UnitTestImpl11RunAllTestsEv
-   fun:_ZN7testing8UnitTest3RunEv
-   fun:_ZN9TestSuite3RunEv
-   fun:main
-}
 
 {
    bug_47471
    Memcheck:Leak
    ...
    fun:*ExtensionMenuManagerTest*
 }