Remove unused |is_gzipped| from blink_platform_impl.cc DataResource.

Bug: None
Change-Id: I0aed7f841bcf6d9487aa16068a790ab64ffa1b25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265189
Commit-Queue: dpapad <dpapad@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782167}

content/child/blink_platform_impl.cc

@@ -86,12 +86,10 @@ std::unique_ptr<blink::WebThemeEngine> GetWebThemeEngine() {
 }
 
 // This must match third_party/WebKit/public/blink_resources.grd.
-// In particular, |is_gzipped| corresponds to compress="gzip".
 struct DataResource {
   const char* name;
   int id;
   ui::ScaleFactor scale_factor;
-  bool is_gzipped;
 };
 
 class NestedMessageLoopRunnerImpl