Fix header guards in content/.

Generated mechanically as follows:

git ls-files '*.h' | grep -E '^content/' | \
    xargs parallel cpplint.py --filter=-,+build/header_guard -- 2>&1 | \
    grep build/header_guard | tools/apply_cpplint_header_guard.py

Bug: 1200694
Change-Id: Iaf6b1c84150d617c3eecc69fb0751ad76dd7fe3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2839364
Reviewed-by: Kinuko Yasuda <[email protected]>
Commit-Queue: Lei Zhang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#874577}
diff --git a/content/browser/renderer_host/input/synthetic_touch_driver.h b/content/browser/renderer_host/input/synthetic_touch_driver.h
index d029a17f7e..6f9bdb9 100644
--- a/content/browser/renderer_host/input/synthetic_touch_driver.h
+++ b/content/browser/renderer_host/input/synthetic_touch_driver.h
@@ -75,4 +75,4 @@
 
 }  // namespace content
 
-#endif  // CONTENT_COMMON_INPUT_SYNTHETIC_TOUCH_DRIVER_H_
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCH_DRIVER_H_