Update valgrind suppressions.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 1a2538d2b7ead701fc374911f72f5fc382be6b70..036adc1406beaed0724e009e5baa33f65a26ca9c 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -1091,3 +1091,29 @@
    fun:_ZN3IPC16MessageWithTupleI6Tuple4Ii19RendererPreferences14WebPreferencesiEE8DispatchI12RenderThreadMS7_FviRKS2_RKS3_iEEEbPKNS_7MessageEPT_T0_
    fun:_ZN12RenderThread24OnControlMessageReceivedERKN3IPC7MessageE
 }
+{
+   bug_26966_2
+   Memcheck:Leak
+   fun:malloc
+   fun:_ZN3WTF10fastMallocEj
+   fun:_ZN7WebCore10StringImpl19createUninitializedEjRPt
+   fun:_ZN7WebCore10StringImpl6createEPKcj
+   fun:_ZN7WebCore10StringImpl6createEPKc
+   fun:_ZN7WebCore17CStringTranslator9translateERPNS_10StringImplERKPKcj
+   fun:_ZN3WTF24HashSetTranslatorAdapterIPN7WebCore10StringImplENS_10HashTraitsIS3_EEPKcNS1_17CStringTranslatorEE9translateERS3_RKS7_SC_j
+   fun:_ZN3WTF9HashTableIPN7WebCore10StringImplES3_NS_17IdentityExtractorIS3_EENS1_10StringHashENS_10HashTraitsIS3_EES8_E18addPassingHashCodeIPKcSC_NS_24HashSetTranslatorAdapterIS3_S8_SC_NS1_17CStringTranslatorEEEEESt4pairINS_17HashTableIteratorIS3_S3_S5_S6_S8_S8_EEbERKT_RKT0_
+   fun:_ZN3WTF7HashSetIPN7WebCore10StringImplENS1_10StringHashENS_10HashTraitsIS3_EEE3addIPKcNS1_17CStringTranslatorEEESt4pairINS_24HashTableIteratorAdapterINS_9HashTableIS3_S3_NS_17IdentityExtractorIS3_EES4_S6_S6_EES3_EEbERKT_
+   fun:_ZN7WebCore12AtomicString3addEPKc
+   fun:_ZN7WebCore12AtomicStringC1EPKc
+   fun:_ZN7WebCore10EventNamesC1Ev
+   fun:_ZN7WebCore16ThreadGlobalDataC1Ev
+   fun:_ZN3WTF14ThreadSpecificIN7WebCore16ThreadGlobalDataEEcvPS2_Ev
+   fun:_ZN3WTF14ThreadSpecificIN7WebCore16ThreadGlobalDataEEdeEv
+   fun:_ZN7WebCore16threadGlobalDataEv
+   fun:_ZN7WebCore10StringImpl5emptyEv
+   fun:_ZN7WebCore12AtomicString3addEPKc
+   fun:_ZN7WebCore12AtomicStringC1EPKc
+   fun:_ZN7WebCore12AtomicString4initEv
+   fun:_ZN6WebKit10initializeEPNS_12WebKitClientE
+   fun:_ZN12RenderThread23EnsureWebKitInitializedEv
+}