Move StartsWith[ASCII] to base namespace.

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index 36525e1fc75492dbb5a53a85d03ca2610fc36cf6..78939bb0167d693444707233ea5ba300d1cc7eb3 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -1026,8 +1026,8 @@ WebData BlinkPlatformImpl::loadResource(const char* name) {
     return WebData();
 
   // Check the name prefix to see if it's an audio resource.
-  if (StartsWithASCII(name, "IRC_Composite", true) ||
-      StartsWithASCII(name, "Composite", true))
+  if (base::StartsWithASCII(name, "IRC_Composite", true) ||
+      base::StartsWithASCII(name, "Composite", true))
     return loadAudioSpatializationResource(name);
 
   // TODO(flackr): We should use a better than linear search here, a trie would