Migrate HostZoomMap to live in StoragePartition.

chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc

Index: chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
diff --git a/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc b/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
index 412579461379c95333833a5cc220588830a831e0..e15f024f0ec98db3140b979bbc7911e137d9566c 100644
--- a/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
+++ b/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
@@ -34,33 +34,33 @@ std::string GetHash(
 namespace chrome {
 
 ChromeZoomLevelPrefs::ChromeZoomLevelPrefs(PrefService* pref_service,
-                                           const base::FilePath& profile_path)
+                                           const base::FilePath& profile_path,
+                                           const base::FilePath& partition_path)
     : pref_service_(pref_service),
-      profile_path_(profile_path),
       host_zoom_map_(nullptr) {
   DCHECK(pref_service_);
+
+  DCHECK(!partition_path.empty());
+  DCHECK((partition_path == profile_path) ||
+         profile_path.IsParent(partition_path));
+  // Create a partition_key string with no '.'s in it. For the default
+  // StoragePartition, this string will always be "0".
+  base::FilePath partition_relative_path;
+  profile_path.AppendRelativePath(partition_path, &partition_relative_path);
+  partition_key_ = GetHash(partition_relative_path);
+
 }
 
 ChromeZoomLevelPrefs::~ChromeZoomLevelPrefs() {
 }
 
-void ChromeZoomLevelPrefs::InitPrefsAndCopyToHostZoomMap(
-    const base::FilePath& partition_path,
+void ChromeZoomLevelPrefs::InitHostZoomMap(
     content::HostZoomMap* host_zoom_map) {
-  DCHECK(!partition_path.empty());
-  DCHECK((partition_path == profile_path_) ||
-         profile_path_.IsParent(partition_path));
   // This init function must be called only once.
   DCHECK(!host_zoom_map_);
   DCHECK(host_zoom_map);
   host_zoom_map_ = host_zoom_map;
 
-  // Create a partition_key string with no '.'s in it. For the default
-  // StoragePartition, this string will always be "0".
-  base::FilePath partition_relative_path;
-  profile_path_.AppendRelativePath(partition_path, &partition_relative_path);
-  partition_key_ = GetHash(partition_relative_path);
-
   // Initialize the default zoom level.
   host_zoom_map_->SetDefaultZoomLevel(GetDefaultZoomLevelPref());