Insert suppression for memory leaks.

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 # running overnight and removing outdated bugs/suppressions.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 2831 matching lines @@
    bug_58340
    Memcheck:Addr4
    fun:_ZNK3WTF6RefPtrIN7WebCore5FrameEE3getEv
    fun:_ZN7WebCore14ResourceLoader18didReceiveResponseEPNS_14ResourceHandleERKNS_16ResourceResponseE
    fun:_ZN7WebCore22ResourceHandleInternal18didReceiveResponseEPN6WebKit12WebURLLoaderERKNS1_14WebURLResponseE
    fun:_ZN11webkit_glue16WebURLLoaderImpl7Context18OnReceivedResponseERKNS_20ResourceResponseInfoEb
    ...
    fun:_ZN11MessageLoop7RunTaskERKNS_11PendingTaskE
 }
 {
+   bug_58449
+   Memcheck:Leak
+   fun:_Znw*
+   ...
+   fun:_ZN11ProfileImpl18GetDownloadManagerEv
+}
+{
    bug_58546
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN27SSLConfigServiceManagerPrefC1EP7Profile
    fun:_ZN23SSLConfigServiceManager20CreateDefaultManagerEP7Profile
    fun:_ZN11ProfileImplC1ERK8FilePath
    fun:_ZN7Profile13CreateProfileERK8FilePath
    fun:_ZN14ProfileManager13CreateProfileERK8FilePath
    fun:_ZN14ProfileManager10GetProfileERK8FilePathb
    fun:_ZN14ProfileManager17GetDefaultProfileERK8FilePath
@@ skipping 1825 matching lines @@
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }