Widen suppression for gfx::GLContextOSMesa::MakeCurrent leak

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 # running overnight and removing outdated bugs/suppressions.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 197 matching lines @@
    fun:RootWindowHostX11
    fun:aura::RootWindowHost::Create
 }
 # leak in OSMesa used to run compositor_unittests in bots.
 {
    bug_148477_a
    Heapcheck:Leak
    ...
    fun:gfx::GLContextOSMesa::MakeCurrent
    ...
-   fun:webkit::gpu::GLInProcessContext::PumpCommands
+   fun:webkit::gpu::GLInProcessContext::*
 }
 {
    bug_148477_b
    Heapcheck:Leak
    ...
    fun:gfx::GLApiBase::glCompileShaderFn
    fun:webkit::gpu::WebGraphicsContext3DInProcessImpl::compileShader
    fun:cc::ProgramBindingBase::LoadShader
    fun:cc::ProgramBindingBase::Init
    fun:ProgramBinding
@@ skipping 1646 matching lines @@
    fun:~MirrorWindowCreator
    fun:operator
    fun:~scoped_ptr_impl
    fun:~scoped_ptr
    fun:ash::internal::DisplayManager::UpdateDisplays
    fun:ash::internal::DisplayManager::OnNativeDisplaysChanged
    fun:ash::test::DisplayManagerTestApi::UpdateDisplay
    fun:ash::test::AshTestBase::UpdateDisplay
    fun:ash::internal::MirrorWindowControllerTest_MirrorCursor_Test::TestBody
 }