Suppress heapchecker leaks.

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 # running overnight and removing outdated bugs/suppressions.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 779 matching lines @@
    fun:HistoryService::BackendDelegate::DBLoaded
    fun:history::HistoryBackend::Init
 }
 
 {
    bug_19775_d
    Heapcheck:Leak
    ...
    fun:ProfileManagerTest_CreateAndUseTwoProfiles_Test::TestBody
 }
+{
+   bug_47188_a
+   Heapcheck:Leak
+   fun:net::SingleThreadedProxyResolver::GetProxyForURL
+   fun:net::::IOThread::Init
+   fun:base::Thread::ThreadMain
+   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:GURL
+   fun:net::::IOThread::Init
+   fun:base::Thread::ThreadMain
+   fun:ThreadFunc
+   fun:start_thread
+}
+{
+   bug_47188_c
+   Heapcheck:Leak
+   ...
+   fun:net::SingleThreadedProxyResolver::Job::DoQuery
+   fun:void DispatchToMethod
+   fun:RunnableMethod::Run
+   fun:MessageLoop::RunTask
+   fun:MessageLoop::DeferOrRunPendingTask
+   fun:MessageLoop::DoWork
+   fun:base::MessagePumpDefault::Run
+   fun:MessageLoop::RunInternal
+   fun:MessageLoop::RunHandler
+   fun:MessageLoop::Run
+   fun:base::Thread::Run
+   fun:base::Thread::ThreadMain
+   fun:ThreadFunc
+   fun:start_thread
+}