Suppression for memory leak in ExtensionsServiceTest.InstallExtension unit test

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 565 matching lines @@
    fun:CGColorTransformConvertData
    fun:img_colormatch_read
    fun:img_alphamerge_read
    fun:img_data_lock
    fun:CGSImageDataLock
    fun:ripc_AcquireImage
    fun:ripc_DrawImage
    fun:CGContextDrawImage
    fun:_ZN3gfx17CGImageToSkBitmapEP7CGImage
    fun:_ZNK11webkit_glue12ImageDecoder6DecodeEPKhm
-   fun:_ZL11DecodeImageRK8FilePath
+   fun:_Z*
    fun:_ZN17ExtensionUnpacker15AddDecodedImageERK8FilePath
    fun:_ZN17ExtensionUnpacker3RunEv
 }
 {
    bug_30632a
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN13PluginService24FindOrStartPluginProcessERK8FilePath
 }
 {
@@ skipping 694 matching lines @@
 }
 {
    bug_49250
    Memcheck:Cond
    fun:gleUpdateFogData
    fun:gleUpdateState
    fun:_ZN8remoting11CapturerMac12CaptureRectsERKSt6vectorIN3gfx4RectESaIS3_EEP14CallbackRunnerI6Tuple1I13scoped_refptrINS_8Capturer11CaptureDataEEEE
    fun:_ZN8remoting8Capturer19CaptureInvalidRectsEP14CallbackRunnerI6Tuple1I13scoped_refptrINS0_11CaptureDataEEEE
    fun:_ZN8remoting28CapturerMacTest_Capture_Test8TestBodyEv
 }