[ios] Removed RequestTracker dependency from WebLoadParams.

ios/web/web_state/web_state_impl.mm

Index: ios/web/web_state/web_state_impl.mm
diff --git a/ios/web/web_state/web_state_impl.mm b/ios/web/web_state/web_state_impl.mm
index 9cd3386c3ec7b6337536194d3ee4e719efef4544..0fa982f2182f7167eb8ceb072d20b6790db6b63b 100644
--- a/ios/web/web_state/web_state_impl.mm
+++ b/ios/web/web_state/web_state_impl.mm
@@ -38,7 +38,6 @@ WebStateImpl::WebStateImpl(BrowserState* browser_state)
       web_controller_(nil),
       navigation_manager_(this, browser_state),
       interstitial_(nullptr),
-      cache_mode_(net::RequestTracker::CACHE_NORMAL),
       weak_factory_(this) {
   GlobalWebStateEventTracker::GetInstance()->OnWebStateCreated(this);
 }
@@ -439,14 +438,6 @@ RequestTrackerImpl* WebStateImpl::GetRequestTracker() {
   return request_tracker_.get();
 }
 
-net::RequestTracker::CacheMode WebStateImpl::GetCacheMode() {
-  return cache_mode_;
-}
-
-void WebStateImpl::SetCacheMode(net::RequestTracker::CacheMode mode) {
-  cache_mode_ = mode;
-}
-
 NSString* WebStateImpl::GetRequestGroupID() {
   if (request_group_id_.get() == nil)
     request_group_id_.reset([GenerateNewRequestGroupID() copy]);