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

media/blink/buffered_resource_loader.cc

Index: media/blink/buffered_resource_loader.cc
diff --git a/media/blink/buffered_resource_loader.cc b/media/blink/buffered_resource_loader.cc
index b608884216f54c45a43a820a46cda406580d1c0f..bb946cca0cab7ce3563f7061a9906d9d9db69737 100644
--- a/media/blink/buffered_resource_loader.cc
+++ b/media/blink/buffered_resource_loader.cc
@@ -728,8 +728,10 @@
     int64_t* last_byte_position,
     int64_t* instance_size) {
   const std::string kUpThroughBytesUnit = "bytes ";
-  if (content_range_str.find(kUpThroughBytesUnit) != 0)
-    return false;
+  if (!base::StartsWith(content_range_str, kUpThroughBytesUnit,
+                        base::CompareCase::SENSITIVE)) {
+    return false;
+  }
   std::string range_spec =
       content_range_str.substr(kUpThroughBytesUnit.length());
   size_t dash_offset = range_spec.find("-");