Add includes for string_number_conversions.h.

These files currently rely on getting these includes
transitively via inspector_protocol generated code.
Would like to make the dependency direct so it's easier
to change the generated code.

Change-Id: I84cb8889c6fd5c0d2245a91cb1b667f3e79f2a12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037966Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739113}

components/ui_devtools/css_agent.cc

@@ -4,6 +4,7 @@
 
 #include "components/ui_devtools/css_agent.h"
 
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "components/ui_devtools/agent_util.h"

components/ui_devtools/css_agent_unittest.cc

@@ -4,6 +4,7 @@
 
 #include "components/ui_devtools/css_agent.h"
 
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/task_environment.h"

components/ui_devtools/dom_agent.cc

@@ -10,6 +10,7 @@
 #include <utility>
 
 #include "base/containers/adapters.h"
+#include "base/strings/string_number_conversions.h"
 #include "components/ui_devtools/devtools_server.h"
 #include "components/ui_devtools/root_element.h"
 #include "components/ui_devtools/ui_element.h"

components/ui_devtools/views/window_element.cc

@@ -4,6 +4,7 @@
 
 #include "components/ui_devtools/views/window_element.h"
 
+#include "base/strings/string_number_conversions.h"
 #include "components/ui_devtools/Protocol.h"
 #include "components/ui_devtools/ui_element_delegate.h"
 #include "components/ui_devtools/views/element_utility.h"

components/ui_devtools/viz/frame_sink_element.cc

@@ -4,6 +4,7 @@
 
 #include "components/ui_devtools/viz/frame_sink_element.h"
 
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "components/ui_devtools/Protocol.h"
 #include "components/ui_devtools/ui_element_delegate.h"