Reland: Move ExtensionProcessManager to src/extensions, part 4

Reland of https://codereview.chromium.org/62713003/ - the original patch broke the Google Chrome OS official builder due to a missing dependency on the extensions api target in extensions/extensions.gyp.

* Move c/b/extensions/extension_process_manager.h to
extensions/browser/process_manager.h
* Rename ExtensionsProcessManager to ProcessManager
* Place it in the "extensions" namespace

BUG=313481
TEST=browser_tests, unit_tests
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Review URL: https://codereview.chromium.org/67253003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234149 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/translate/translate_manager_browsertest.cc b/chrome/browser/translate/translate_manager_browsertest.cc
index 6317ad5..afffdda3 100644
--- a/chrome/browser/translate/translate_manager_browsertest.cc
+++ b/chrome/browser/translate/translate_manager_browsertest.cc
@@ -1331,7 +1331,7 @@
       static_cast<TestingProfile*>(web_contents()->GetBrowserContext());
   static_cast<extensions::TestExtensionSystem*>(
       extensions::ExtensionSystem::Get(test_profile))->
-      CreateExtensionProcessManager();
+      CreateProcessManager();
   test_profile->ForceIncognito(true);
   for (int i = 0; i < 8; ++i) {
     SCOPED_TRACE(::testing::Message() << "Iteration " << i <<