Fix content/common depending on content/shell.

content/DEPS

Index: content/DEPS
diff --git a/content/DEPS b/content/DEPS
index b7cda8593eaef5d064b454078771a96f7d616786..02ebe8976ce88db0cb9aa9d8b6b05068715029e2 100644
--- a/content/DEPS
+++ b/content/DEPS
@@ -10,7 +10,6 @@ include_rules = [
   "+content/grit",
   "+content/public/common",
   "+content/public/test",
-  "+content/shell",  # for content_browsertests
   "+content/test",
 
   "+blink",
@@ -112,3 +111,9 @@ include_rules = [
   # For generated JNI includes.
   "+jni",
 ]
+
+specific_include_rules = {
+  ".*browsertest.*\.cc": [
+    "+content/shell",  # for content_browsertests
+  ],
+}