Remove supression of out-of-bounds reads in GLES2ImplementationTest.TexImage3DSingleCommand

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 # running overnight and removing outdated bugs/suppressions.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 3507 matching lines @@
 }
 {
    bug_441333
    Memcheck:Uninitialized
    fun:av_packet_unpack_dictionary
    fun:add_metadata_from_side_data
    fun:avcodec_decode_*
    fun:avcodec_decode_*
 }
 {
-   bug_447788
-   Memcheck:Unaddressable
-   ...
-   fun:_ZN3gpu5gles252GLES2ImplementationTest_TexImage3DSingleCommand_Test8TestBodyEv
-}
-{
    bug_448700_a
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN10extensions11ApiTestBase15RegisterModulesEv
    fun:_ZN10extensions11ApiTestBase5SetUpEv
 }
 {
    bug_448700_b
    Memcheck:Leak
@@ skipping 50 matching lines @@
    bug_449175_b
    Memcheck:Leak
    fun:calloc
    fun:pthread_setspecific
    fun:_ZN4base8internal19ThreadLocalPlatform14SetValueInSlotEjPv
    fun:_ZN4base18ThreadLocalPointerIN4mojo6common15MessagePumpMojoEE3SetEPS3_
    fun:_ZN4mojo6common15MessagePumpMojoC1Ev
    fun:_ZN4mojo6common15MessagePumpMojo6CreateEv
 }