Remove dependency of c/b/loader on c/b/host_zoom_map_impl.h

content/browser/frame_host/render_frame_message_filter.cc

Index: content/browser/frame_host/render_frame_message_filter.cc
diff --git a/content/browser/frame_host/render_frame_message_filter.cc b/content/browser/frame_host/render_frame_message_filter.cc
index 9776983665a13957b204f53c19fa4a090e58cacc..5db2491ae81b24e443cf333d83b4d0adb99dcfb9 100644
--- a/content/browser/frame_host/render_frame_message_filter.cc
+++ b/content/browser/frame_host/render_frame_message_filter.cc
@@ -15,6 +15,7 @@
 #include "content/browser/download/download_stats.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
+#include "content/browser/host_zoom_map_impl.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
 #include "content/browser/resource_context_impl.h"
 #include "content/common/content_constants_internal.h"
@@ -25,6 +26,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/download_url_parameters.h"
+#include "content/public/browser/storage_partition.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ -221,7 +223,13 @@ RenderFrameMessageFilter::RenderFrameMessageFilter(
       resource_context_(browser_context->GetResourceContext()),
       render_widget_helper_(render_widget_helper),
       incognito_(browser_context->IsOffTheRecord()),
-      render_process_id_(render_process_id) {
+      render_process_id_(render_process_id),
+      host_zoom_map_impl_(render_process_id
+                              ? static_cast<const HostZoomMapImpl*>(
+                                    RenderProcessHost::FromID(render_process_id)
+                                        ->GetStoragePartition()
+                                        ->GetHostZoomMap())
+                              : nullptr) {
 }
 
 RenderFrameMessageFilter::~RenderFrameMessageFilter() {
@@ -448,6 +456,19 @@ void RenderFrameMessageFilter::GetCookies(int render_frame_id,
                  render_frame_id, url, first_party_for_cookies, callback));
 }
 
+void RenderFrameMessageFilter::GetHostZoomLevel(
+    int32_t render_frame_id,
+    const GURL& url,
+    const GetHostZoomLevelCallback& callback) {
+  // We need to make sure this is serviced directly on the IO thread so that it
+  // does not get out of order with the resource request in AsyncResourceHandler
+  // which lives on the IO thread.
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  double zoom_level = host_zoom_map_impl_->GetZoomLevelForView(
+      url, render_process_id_, render_frame_id);
+  callback.Run(zoom_level);
+}
+
 #if defined(ENABLE_PLUGINS)
 
 void RenderFrameMessageFilter::OnGetPlugins(