storage: Move testing code from namespace content to storage.

Testing code that was moved from //content to //storage is still under
the content namespace. This is hindering Storage Service-related
refactoring. This CL updates the namespace to reflect the directory
structure.

This CL also makes mechanical code health improvements (such as new ->
base::MakeRefCounted) applied when obvious. clang-tidy improvements are
applied where requested by Tricium.

Bug: 653751
Change-Id: I3d0b5712b531d0d33205ee2a3de3de5dce73e84d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2048986
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740558}

diff --git a/storage/browser/quota/quota_settings.cc b/storage/browser/quota/quota_settings.cc
index b2210b5..316b2d7 100644
--- a/storage/browser/quota/quota_settings.cc
+++ b/storage/browser/quota/quota_settings.cc

@@ -5,7 +5,9 @@
 #include "storage/browser/quota/quota_settings.h"
 
 #include <algorithm>
+#include <limits>
 #include <memory>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/rand_util.h"
@@ -30,7 +32,7 @@
   return value + (value * (random_percent / 100.0));
 }
 
-storage::QuotaSettings CalculateIncognitoDynamicSettings(
+QuotaSettings CalculateIncognitoDynamicSettings(
     int64_t physical_memory_amount) {
   // The incognito pool size is a fraction of the amount of system memory,
   // and the amount is capped to a hard limit.
@@ -47,7 +49,7 @@
         RandomizeByPercent(max_incognito_pool_size, kRandomizedPercentage);
   }
 
-  storage::QuotaSettings settings;
+  QuotaSettings settings;
   settings.pool_size = std::min(
       max_incognito_pool_size,
       static_cast<int64_t>(physical_memory_amount * incognito_pool_size_ratio));
@@ -57,7 +59,7 @@
   return settings;
 }
 
-base::Optional<storage::QuotaSettings> CalculateNominalDynamicSettings(
+base::Optional<QuotaSettings> CalculateNominalDynamicSettings(
     const base::FilePath& partition_path,
     bool is_incognito,
     QuotaDeviceInfoHelper* device_info_helper) {
@@ -118,7 +120,7 @@
   const double kSessionOnlyHostQuotaRatio = 0.1;  // 10%
   const int64_t kMaxSessionOnlyHostQuota = 300 * kMBytes;
 
-  storage::QuotaSettings settings;
+  QuotaSettings settings;
 
   int64_t total = device_info_helper->AmountOfTotalDiskSpace(partition_path);
   if (total == -1) {