[M54 merge] Lock down creation of blob:chrome-extension URLs from non-extension processes.

chrome/browser/DEPS

Index: chrome/browser/DEPS
diff --git a/chrome/browser/DEPS b/chrome/browser/DEPS
index 1efc705847dc5c9627232db645e6f3867b5c5f1a..85dddb45b152c0e37514bc2553d2d0bf8d0b75aa 100644
--- a/chrome/browser/DEPS
+++ b/chrome/browser/DEPS
@@ -106,3 +106,11 @@ include_rules = [
   "+third_party/WebKit/public/web/WebTextDirection.h",
   "+third_party/WebKit/public/web/WebWindowFeatures.h",
 ]
+
+specific_include_rules = {
+  # Exploits don't abide by DEPS; so all IPC message definitions are fair game
+  # in this type of test.
+  'chrome_security_exploit_browsertest\.cc' : [
+    '+content/common',
+  ],
+}