Fix a typo in gpu_info_collector_linux.cc.

content/gpu/gpu_info_collector_linux.cc

Index: content/gpu/gpu_info_collector_linux.cc
diff --git a/content/gpu/gpu_info_collector_linux.cc b/content/gpu/gpu_info_collector_linux.cc
index ab5799fa85667d740b09d8911f915dea6dd9ef3d..9afef2380cd28563921db9c30e68ad5b9e6732a9 100644
--- a/content/gpu/gpu_info_collector_linux.cc
+++ b/content/gpu/gpu_info_collector_linux.cc
@@ -179,7 +179,7 @@ std::string CollectDriverVersionNVidia() {
   }
   int event_base = 0, error_base = 0;
   if (!XNVCTRLQueryExtension(display, &event_base, &error_base)) {
-    LOG(INFO) << "NVCtrl extension does not exits.";
+    LOG(INFO) << "NVCtrl extension does not exist.";
     return std::string();
   }
   int screen_count = ScreenCount(display);