Switch to standard integer types in content/.

BUG=138542
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Review URL: https://codereview.chromium.org/1544273002

Cr-Commit-Position: refs/heads/master@{#366875}
diff --git a/content/gpu/gpu_process.h b/content/gpu/gpu_process.h
index 0511fa8..14754e90e 100644
--- a/content/gpu/gpu_process.h
+++ b/content/gpu/gpu_process.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_GPU_GPU_PROCESS_H_
 #define CONTENT_GPU_GPU_PROCESS_H_
 
+#include "base/macros.h"
 #include "content/child/child_process.h"
 
 namespace content {