Enable -Wextra-semi in iOS builds.

Bug: 926235
Change-Id: I1c9f46a30392258e553a51d1033fde4d41e04210
Reviewed-on: https://chromium-review.googlesource.com/c/1489180
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635612}

build/config/compiler/BUILD.gn

@@ -1590,7 +1590,8 @@ config("chromium_code") {
 
     # TODO(thakis): Enable this for more platforms, https://crbug.com/926235
     has_dchecks = is_debug || dcheck_always_on
-    if (has_dchecks && (is_android || (is_linux && !use_libfuzzer) || is_mac)) {
+    if (has_dchecks &&
+        (is_android || is_ios || (is_linux && !use_libfuzzer) || is_mac)) {
       cflags += [ "-Wextra-semi" ]
     }
   }

ios/chrome/browser/ui/side_swipe/side_swipe_controller_unittest.mm

@@ -44,7 +44,7 @@ class SideSwipeControllerTest : public PlatformTest {
     view_ = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 240)];
 
     [side_swipe_controller_ addHorizontalGesturesToView:view_];
-  };
+  }
 
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> browser_state_;