Relaxing the suppression to cover all memory error in ExtensionPrefStoreTest

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 # running overnight and removing outdated bugs/suppressions.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 3568 matching lines @@
    fun:_ZN3net20MockHostResolverBaseC2Eb
    fun:_ZN3net16MockHostResolverC1Ev
    fun:_ZN3net66_GLOBAL__N_net_spdy_spdy_http_stream_unittest.cc_9D292295_6F30AFB219SessionDependenciesC1Ev
    fun:_ZN3net66_GLOBAL__N_net_spdy_spdy_http_stream_unittest.cc_9D292295_6F30AFB218SpdyHttpStreamTestC2Ev
    fun:_ZN3net66_GLOBAL__N_net_spdy_spdy_http_stream_unittest.cc_9D292295_6F30AFB235SpdyHttpStreamTest_SendRequest_TestC1Ev
    fun:_ZN7testing8internal15TestFactoryImplIN3net66_GLOBAL__N_net_spdy_spdy_http_stream_unittest.cc_9D292295_6F30AFB235SpdyHttpStreamTest_SendRequest_TestEE10CreateTestEv
 }
 {
    bug_48980_a
    Memcheck:Leak
-   fun:_Znw*
    ...
    fun:_ZN18ExtensionPrefStore20InstallExtensionPrefESsPKwP5Value
    fun:_ZN56ExtensionPrefStoreTest_*_Test8TestBodyEv
 }
 {
    bug_48980_b
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN5Value17CreateStringValueERKSs
-   fun:_ZN56ExtensionPrefStoreTest_*_Test8TestBodyEv
+   fun:_ZN*ExtensionPrefStoreTest_*_Test8TestBodyEv
 }
 {
    bug_48980_c
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN44ExtensionPrefStoreTest_NotifyWhenNeeded_Test8TestBodyEv
 }
 {
    bug_48998
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN21BrowserMainPartsPosix16TemporaryPosix_1Ev
    fun:_Z11BrowserMainRK18MainFunctionParams
    fun:ChromeMain
    fun:main
 }