Suppress memory leak in PluginFinder::GetPluginMetadata

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 5911 matching lines @@
    Memcheck:Leak
    fun:malloc
    fun:get_peer_sock_name
    fun:_xcb_get_auth_info
    fun:xcb_connect_to_display_with_auth_info
    fun:_XConnectXCB
    fun:XOpenDisplay
    fun:_ZN4base18MessagePumpAuraX1118GetDefaultXDisplayEv
 }
 {
-   bug_147755
+   bug_147755_a
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN12PluginFinder18GetPluginInstallerERKN6webkit13WebPluginInfoE
    fun:_ZN11PluginPrefs30EnablePluginIfPossibleCallbackEbRK8FilePathRKN4base8CallbackIFvbEEEP12PluginFinder
 }
 {
+   bug_147755_b
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN12PluginFinder17GetPluginMetadataERKN6webkit13WebPluginInfoE
+   fun:_ZN11PluginPrefs12EnablePluginEbRK8FilePathRKN4base8CallbackIFvbEEE
+   fun:_ZN15PluginPrefsTest25EnablePluginSynchronouslyEbRK8FilePathb
+   fun:_ZN44PluginPrefsTest_UnifiedPepperFlashState_Test8TestBodyEv
+}
+{
    bug_148637_a
    Memcheck:Unaddressable
    ...
    fun:_ZN9SkPathRef6EditorC1EP12SkAutoTUnrefIS_Eii
    fun:_ZN6SkPath10incReserveEj
    fun:_ZN7WebCoreL23setPathFromConvexPointsEP6SkPathmPKNS_10FloatPointE
    fun:_ZN7WebCore15GraphicsContext17drawConvexPolygonEmPKNS_10FloatPointEb
 }
 {
    bug_148637_b
@@ skipping 229 matching lines @@
    fun:_ZN7WebCore21RenderLayerCompositor21enableCompositingModeEb
    fun:_ZN7WebCore21RenderLayerCompositor13updateBackingEPNS_11RenderLayerENS0_24CompositingChangeRepaintE
 }
 {
    bug_152445
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN7fileapi22LocalFileChangeTrackerC1EPNS_19LocalFileSyncStatusERK8FilePathPN4base19SequencedTaskRunnerE
    fun:_ZN7fileapi26LocalFileChangeTrackerTest5SetUpEv
 }