Adapt String::find method via StringUtil adapter.

This is needed to insulate generated code from blink::protocol namespace
from naming changes that we plan to do in the Great Blink Rename (which
in particular will rename wtf::StringBuilder::find method into Find).

This CL also includes roll of inspector_protocol which starts to
generate code that uses the new StringUtil::find adapter method:
rolling third_party/inspector to 1a7cbe8ba8fa0d622586f549a97c73d9b52efbea

BUG=683447

Review-Url: https://codereview.chromium.org/2675763003
Cr-Commit-Position: refs/heads/master@{#42936}

src/inspector/string-util.h

@@ -32,6 +32,12 @@ class StringUtil {
     return String::fromInteger(number);
   }
   static String fromDouble(double number) { return String::fromDouble(number); }
+  static size_t find(const String& s, const char* needle) {
+    return s.find(needle);
+  }
+  static size_t find(const String& s, const String& needle) {
+    return s.find(needle);
+  }
   static const size_t kNotFound = String::kNotFound;
   static void builderAppend(StringBuilder& builder, const String& s) {
     builder.append(s);

third_party/inspector_protocol/README.v8

@@ -2,7 +2,7 @@ Name: inspector protocol
 Short Name: inspector_protocol
 URL: https://chromium.googlesource.com/deps/inspector_protocol/
 Version: 0
-Revision: 1a131872167f0f7653629326891aa3ec94417f27
+Revision: 1a7cbe8ba8fa0d622586f549a97c73d9b52efbea
 License: BSD
 License File: LICENSE
 Security Critical: no

third_party/inspector_protocol/lib/DispatcherBase_cpp.template

@@ -276,7 +276,7 @@ DispatchResponse::Status UberDispatcher::dispatch(std::unique_ptr<Value> parsedM
         return DispatchResponse::kError;
     }
 
-    size_t dotIndex = method.find(".");
+    size_t dotIndex = StringUtil::find(method, ".");
     if (dotIndex == StringUtil::kNotFound) {
         if (m_fallThroughForNotFound)
             return DispatchResponse::kFallThrough;