Fix a crash on Mac due to TextInputManager being null

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 2b0a11d2a17b90d248e7fd40e21649042cd28697..a6803570beb3521971042ad90777b9780bbf1a07 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -564,7 +564,8 @@ RenderWidgetHostImpl* RenderWidgetHostViewMac::GetActiveWidget() {
 
 const TextInputManager::CompositionRangeInfo*
 RenderWidgetHostViewMac::GetCompositionRangeInfo() {
-  return text_input_manager_->GetCompositionRangeInfo();
+  return GetTextInputManager() ? text_input_manager_->GetCompositionRangeInfo()

[EhsanK, 2017/04/10 15:30:39]

This is similar to lines 557 and 561 above. I think this will stop the crash.

+                               : nullptr;
 }
 
 const TextInputManager::TextSelection*