Quota: Remove unnecessary struct definition from header.

Change-Id: I51596508f1db19f83dee2234b14f9f1a52a87b8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975152
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726611}

storage/browser/quota/usage_tracker.cc

@@ -32,6 +32,17 @@ void StripUsageWithBreakdownCallback(
 
 }  // namespace
 
+struct UsageTracker::AccumulateInfo {
+  AccumulateInfo() = default;
+  ~AccumulateInfo() = default;
+
+  size_t pending_clients = 0;
+  int64_t usage = 0;
+  int64_t unlimited_usage = 0;
+  blink::mojom::UsageBreakdownPtr usage_breakdown =
+      blink::mojom::UsageBreakdown::New();
+};
+
 UsageTracker::UsageTracker(
     const std::vector<scoped_refptr<QuotaClient>>& clients,
     blink::mojom::StorageType type,
@@ -201,10 +212,6 @@ void UsageTracker::SetUsageCacheEnabled(QuotaClient::ID client_id,
   client_tracker->SetUsageCacheEnabled(origin, enabled);
 }
 
-UsageTracker::AccumulateInfo::AccumulateInfo() = default;
-
-UsageTracker::AccumulateInfo::~AccumulateInfo() = default;
-
 void UsageTracker::AccumulateClientGlobalLimitedUsage(AccumulateInfo* info,
                                                       int64_t limited_usage) {
   DCHECK_GT(info->pending_clients, 0U);

storage/browser/quota/usage_tracker.h

@@ -72,17 +72,9 @@ class COMPONENT_EXPORT(STORAGE_BROWSER) UsageTracker
                             bool enabled);
 
  private:
-  struct AccumulateInfo {
-    AccumulateInfo();
-    ~AccumulateInfo();
-    size_t pending_clients = 0;
-    int64_t usage = 0;
-    int64_t unlimited_usage = 0;
-    blink::mojom::UsageBreakdownPtr usage_breakdown =
-        blink::mojom::UsageBreakdown::New();
-  };
-
+  struct AccumulateInfo;
   friend class ClientUsageTracker;
+
   void AccumulateClientGlobalLimitedUsage(AccumulateInfo* info,
                                           int64_t limited_usage);
   void AccumulateClientGlobalUsage(AccumulateInfo* info,