Use C++17 structured binding in more places.

Bug: dawn:824
Change-Id: Ie39d4f622bfb3dcc3a74b03d594efcea7139a9dc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/75069
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/dawn_wire/client/RequestTracker.h

@@ -59,16 +59,16 @@ namespace dawn_wire { namespace client {
                 // Move mRequests to a local variable so that further reentrant modifications of
                 // mRequests don't invalidate the iterators.
                 auto allRequests = std::move(mRequests);
-                for (auto& it : allRequests) {
-                    closeFunc(&it.second);
+                for (auto& [_, request] : allRequests) {
+                    closeFunc(&request);
                 }
             }
         }
 
         template <typename F>
         void ForAll(F&& f) {
-            for (auto& it : mRequests) {
-                f(&it.second);
+            for (auto& [_, request] : mRequests) {
+                f(&request);
             }
         }
 

src/dawn_wire/server/Server.cpp

@@ -191,8 +191,8 @@ namespace dawn_wire { namespace server {
     }
 
     bool TrackDeviceChild(DeviceInfo* info, ObjectType type, ObjectId id) {
-        auto it = info->childObjectTypesAndIds.insert(PackObjectTypeAndId(type, id));
-        if (!it.second) {
+        auto [_, inserted] = info->childObjectTypesAndIds.insert(PackObjectTypeAndId(type, id));
+        if (!inserted) {
             // An object of this type and id already exists.
             return false;
         }