Fix AccountInfo uninitialized memory issues.

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 # running overnight and removing outdated bugs/suppressions.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 3376 matching lines @@
    ...
    fun:_ZN7GrGLGpu6CreateElRK16GrContextOptionsP9GrContext
    fun:_ZN5GrGpu6CreateE9GrBackendlRK16GrContextOptionsP9GrContext
    fun:_ZN9GrContext4initE9GrBackendlRK16GrContextOptions
    fun:_ZN9GrContext6CreateE9GrBackendlRK16GrContextOptions
    fun:_ZN9GrContext6CreateE9GrBackendl
    ...
    fun:_ZN2cc10GLRenderer18DrawRenderPassQuadEPNS_14DirectRenderer12DrawingFrameEPKNS_18RenderPassDrawQuadEPKN3gfx5QuadFE
    fun:_ZN2cc10GLRenderer10DoDrawQuadEPNS_14DirectRenderer12DrawingFrameEPKNS_8DrawQuadEPKN3gfx5QuadFE
 }
-{
-   bug_577333a
-   Memcheck:Uninitialized
-   ...
-   fun:_ZN47AccountInfoTest_UpdateWithSuccessfulUpdate_Test8TestBodyEv
-}
-{
-   bug_577333b
-   Memcheck:Uninitialized
-   ...
-   fun:_ZN50AccountTrackerServiceTest_SeedAccountInfoFull_Test8TestBodyEv
-}