Reland of place string::find(prefix) == 0 pattern with base::StartsWith().

components/sync_sessions/favicon_cache_unittest.cc

Index: components/sync_sessions/favicon_cache_unittest.cc
diff --git a/components/sync_sessions/favicon_cache_unittest.cc b/components/sync_sessions/favicon_cache_unittest.cc
index 0eb20923ed9af5384fed9c0151b2a265ca040187..b2aac8caee18530076b8c01c369096274bda8e5a 100644
--- a/components/sync_sessions/favicon_cache_unittest.cc
+++ b/components/sync_sessions/favicon_cache_unittest.cc
@@ -11,6 +11,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "sync/api/attachments/attachment_id.h"
@@ -244,7 +245,7 @@
   std::string tag = syncer::SyncDataLocal(change.sync_data()).GetTag();
   const std::string kPrefix = "http://bla.com/";
   const std::string kSuffix = ".ico";
-  if (tag.find(kPrefix) != 0)
+  if (!base::StartsWith(tag, kPrefix, base::CompareCase::SENSITIVE))
     return -1;
   std::string temp = tag.substr(kPrefix.length());
   if (temp.rfind(kSuffix) <= 0)