Remove suppression for media::Pipeline::DoPause().

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 5751 matching lines @@
    bug_139664
    Memcheck:Uninitialized
    fun:_ZN4skia12_GLOBAL__N_18ClampTo8Ei
    fun:_ZN4skia12_GLOBAL__N_120ConvolveHorizontallyILb1EEEvPKhRKNS_19ConvolutionFilter1DEPh
    fun:_ZN4skia14BGRAConvolve2DEPKhibRKNS_19ConvolutionFilter1DES4_iPhb
    fun:_ZN4skia15ImageOperations11ResizeBasicERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
    fun:_ZN4skia15ImageOperations6ResizeERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
    fun:_ZNK7WebCore15NativeImageSkia13resizedBitmapERK7SkIRectiiS3_
 }
 {
-   bug_139703
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN5media8Pipeline7DoPauseERKN4base8CallbackIFvvEEE
-   fun:_ZN5media8Pipeline8SeekTaskEN4base9TimeDeltaERKNS1_8CallbackIFvNS_14PipelineStatusEEEE
-}
-{
    bug_139853
    Memcheck:Unaddressable
    fun:_ZN11SkGpuDeviceC1EP9GrContextP9GrTexture
    fun:_ZN7WebCoreL23createAcceleratedCanvas*
    fun:_ZN7WebCore45FrameBufferSkPictureCanvasLayerTextureUpdater17*
    fun:_ZN7WebCore45FrameBufferSkPictureCanvasLayerTextureUpdater7Texture10updateRectEPNS_18CCResourceProviderERKNS_7IntRectES6_
    fun:_ZN7WebCore12_GLOBAL__N_126UnthrottledTextureUploader13uploadTextureEPNS_19LayerTextureUpdater7TextureEPNS_18CCResourceProviderENS_7IntRectES7_
    fun:_ZN7WebCore16CCTextureUpdater6updateEPNS_18CCResourceProviderEPNS_13TextureCopierEPNS_15TextureUploaderEm
    fun:_ZN7WebCore19CCSingleThreadProxy8doCommitERNS_16CCTextureUpdaterE
    fun:_ZN7WebCore19CCSingleThreadProxy18commitAndCompositeEv
@@ skipping 76 matching lines @@
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }