Remove remaining legacy SplitString calls.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index ae64537825b7171f698a3b961ad9cc83426dfe04..e4a6b5a1e73282f2596436321bd1b1e9aef562dd 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -424,8 +424,8 @@ void CreateEmbeddedWorkerSetup(
 
 void StringToUintVector(const std::string& str, std::vector<unsigned>* vector) {
   DCHECK(vector->empty());
-  std::vector<std::string> pieces;
-  base::SplitString(str, ',', &pieces);
+  std::vector<std::string> pieces = base::SplitString(
+      str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   DCHECK_EQ(pieces.size(), static_cast<size_t>(gfx::BufferFormat::LAST) + 1);
   for (size_t i = 0; i < pieces.size(); ++i) {
     unsigned number = 0;