Replace HistoryQuickProvider protobuf-based caching with an SQLite-based database.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 151481)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -5777,6 +5777,30 @@
    fun:_ZN15ExtensionAction16RunIconAnimationEi
    fun:_ZN15ExtensionAction13SetAppearanceEiNS_10AppearanceE
 }
+{
+   bug_144081
+   Memcheck:Leak
+   ...
+   fun:_ZN7history19URLIndexPrivateData18RebuildFromHistoryEPNS_15HistoryDatabaseE13scoped_refptrIS0_E
+   fun:_ZN7history16InMemoryURLIndex35RebuildPrivateDataFromHistoryDBTask13RunOnDBThreadEPNS_14HistoryBackendEPNS_15HistoryDatabaseE
+}
+{
+   bug_144082
+   Memcheck:Leak
+   ...
+   fun:_ZN7history16InMemoryURLIndex37DoneRebuidingPrivateDataFromHistoryDBEb13scoped_refptrINS_19URLIndexPrivateDataEE
+   fun:_ZN7history16InMemoryURLIndex35RebuildPrivateDataFromHistoryDBTask19DoneRunOnMainThreadEv
+}
+{
+   bug_144083
+   Memcheck:Leak
+   ...
+   fun:_ZN7history25InitializeSchemeWhitelistEPSt3setISsSt4lessISsESaISsEE
+   fun:_ZN7history19URLIndexPrivateDataC1ERK8FilePathRKSs
+   fun:_ZN7history16InMemoryURLIndexC1EP7ProfileRK8FilePathRKSs
+   fun:_ZN14HistoryService4InitERK8FilePathP15BookmarkServicebb
+   fun:_ZN14TestingProfile18InitHistoryServiceEP14HistoryServiceb
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations