Remove suppression. This has been fixed in WebKit and rolled into Chrome.

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 # running overnight and removing outdated bugs/suppressions.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 5188 matching lines @@
    fun:_ZL19PaintViewIntoCanvasPN6WebKit7WebViewERN4skia14PlatformCanvasE
    fun:_ZN24ChromeRenderViewObserver21CaptureFrameThumbnailEPN6WebKit7WebViewEiiP8SkBitmapP14ThumbnailScore
    fun:_ZN24ChromeRenderViewObserver16CaptureThumbnailEv
    fun:_ZN24ChromeRenderViewObserver15CapturePageInfoEib
    fun:_ZN4base8internal15RunnableAdapterIM24ChromeRenderViewObserverFvibEE3RunEPS2_RKiRKb
    fun:_ZN4base8internal12InvokeHelperILb1EvNS0_15RunnableAdapterIM24ChromeRenderViewObserverFvibEEEFvRKNS_7WeakPtrIS3_EERKiRKbEE8MakeItSoES6_SA_SC_SE_
    fun:_ZN4base8internal7InvokerILi3ENS0_9BindStateINS0_15RunnableAdapterIM24ChromeRenderViewObserverFvibEEEFvPS4_ibEFvNS_7WeakPtrIS4_EEibEEES9_E3RunEPNS0_13BindStateBaseE
    fun:_ZNK4base8CallbackIFvvEE3RunEv
 }
 {
-   bug_104749
-   Memcheck:Unaddressable
-   ...
-   fun:_ZN7WebCore14CachedResource6finishEv
-   fun:_ZN7WebCore17SubresourceLoader16didFinishLoadingEd
-   fun:_ZN7WebCore14ResourceLoader16didFinishLoadingEPNS_14ResourceHandleEd
-   fun:_ZN7WebCore22ResourceHandleInternal16didFinishLoadingEPN6WebKit12WebURLLoaderEd
-   fun:_ZN11webkit_glue16WebURLLoaderImpl7Context18OnCompletedRequestERKN3net16URLRequestStatusERKSsRKN4base4TimeE
-   fun:_ZN12_GLOBAL__N_112RequestProxy22NotifyCompletedRequestERKN3net16URLRequestStatusERKSsRKN4base4TimeE
-   fun:_ZN4base8internal15RunnableAdapterIMN12_GLOBAL__N_112RequestProxyEFvRKN3net16URLRequestStatusERKSsRKNS_4TimeEEE3RunEPS3_S7_S9_SC_
-   fun:_ZN4base8internal12InvokeHelperILb0EvNS0_15RunnableAdapterIMN12_GLOBAL__N_112RequestProxyEFvRKN3net16URLRequestStatusERKSsRKNS_4TimeEEEEFvRKPS4_S8_SA_SD_EE8MakeItSoESG_SJ_S8_SA_SD_
-   fun:_ZN4base8internal7InvokerILi4ENS0_9BindStateINS0_15RunnableAdapterIMN12_GLOBAL__N_112RequestProxyEFvRKN3net16URLRequestStatusERKSsRKNS_4TimeEEEEFvPS5_S9_SB_SE_EFvSI_S7_SsSC_EEESJ_E3RunEPNS0_13BindStateBaseE
-   fun:_ZNK4base8CallbackIFvvEE3RunEv
-}
-{
    bug_105907
    Memcheck:Uninitialized
    ...
    fun:_ZN4skia14BGRAConvolve2DEPKhibRKNS_19ConvolutionFilter1DES4_iPhb
    fun:_ZN4skia15ImageOperations11ResizeBasicERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
    fun:_ZN4skia15ImageOperations6ResizeERK8SkBitmapNS0_12ResizeMethodEiiRK7SkIRect
    fun:_ZN4skia15ImageOperations6ResizeERK8SkBitmapNS0_12ResizeMethodEii
    fun:_ZNK7WebCore15NativeImageSkia13resizedBitmapERK7SkIRectiiS3_
    fun:_ZN7WebCoreL19drawResampledBitmapER8SkCanvasR7SkPaintRKNS_15NativeImageSkiaERK7SkIRectRK6SkRect
    fun:_ZN7WebCoreL13paintSkBitmapEPNS_19PlatformContextSkiaERKNS_15NativeImageSkiaERK7SkIRectRK6SkRectRKN10SkXfermode4ModeE
@@ skipping 133 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
 }