ime: Update the code path in the comment

It took some time for me to find the proper location. Let me
update the comment while I'm at it.

BUG=b:74499980
TEST=try

Change-Id: I6d6f1e0948c5d36675371965b83043a230f147d8
Reviewed-on: https://chromium-review.googlesource.com/1250741Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595382}

ui/base/ime/text_input_flags.h

@@ -8,7 +8,7 @@
 namespace ui {
 
 // Intentionally keep in sync with blink::WebTextInputFlags defined in:
-// third_party/WebKit/public/platform/WebTextInputType.h
+// third_party/blink/public/platform/web_text_input_type.h
 enum TextInputFlags {
   TEXT_INPUT_FLAG_NONE = 0,
   TEXT_INPUT_FLAG_AUTOCOMPLETE_ON = 1 << 0,