Expand the suppression for bug 68304 (leaks in ResourceDispatcherHostTest.*)...

tools/heapcheck/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 # running overnight and removing outdated bugs/suppressions.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 703 matching lines @@
    fun:ThreadFunc
    fun:start_thread
 }
 {
    bug_47188_b
    Heapcheck:Leak
    fun:__gnu_cxx::new_allocator::allocate
    fun:std::string::_Rep::_S_create
    fun:std::string::_Rep::_M_clone
    fun:std::string::reserve
-   fun:bool ::InitCanonical
+   fun:*InitCanonical
    fun:GURL
    fun:net::::IOThread::Init
    fun:base::Thread::ThreadMain
    fun:ThreadFunc
    fun:start_thread
 }
 {
    bug_47188_c
    Heapcheck:Leak
    ...
@@ skipping 451 matching lines @@
    fun:URLRequestTestJob::StartAsync
    fun:void DispatchToMethod
    fun:RunnableMethod::Run
    fun:MessageLoop::RunTask
    fun:MessageLoop::DeferOrRunPendingTask
    fun:MessageLoop::DoWork
 }
 {
    bug_68304
    Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::string::_Rep::_S_create
-   fun:std::string::_M_mutate
-   fun:std::string::_M_replace_safe
-   fun:std::string::assign
-   fun:Pickle::ReadString
    ...
    fun:IPC::ParamTraits::Read
    fun:IPC::ReadParam
    fun:IPC::MessageWithTuple::Read
    fun:IPC::MessageWithTuple::Dispatch
    fun:ResourceDispatcherHost::OnMessageReceived
    fun:ResourceDispatcherHostTest::MakeTestRequest
 }