Remove testing workaround (#1848)

* Turn off -all_load to workaround Analytics duplicate symbol bug b/116139404

FirebaseAnalytics.podspec.json

@@ -1,40 +0,0 @@
-{
-  "authors": "Google, Inc.",
-  "dependencies": {
-    "FirebaseCore": "~> 5.1",
-    "FirebaseInstanceID": "~> 3.2",
-    "GoogleAppMeasurement": "~> 5.1",
-    "GoogleUtilities/AppDelegateSwizzler": "~> 5.2",
-    "GoogleUtilities/MethodSwizzler": "~> 5.2",
-    "GoogleUtilities/NSData+zlib": "~> 5.2",
-    "GoogleUtilities/Network": "~> 5.2",
-    "nanopb": "~> 0.3"
-  },
-  "description": "Firebase Analytics is a free, out-of-the-box analytics solution that inspires actionable insights based on app usage and user engagement.",
-  "frameworks": [
-    "StoreKit"
-  ],
-  "homepage": "https://firebase.google.com/features/analytics/",
-  "libraries": [
-    "c++",
-    "sqlite3",
-    "z"
-  ],
-  "license": {
-    "text": "Copyright 2018 Google",
-    "type": "Copyright"
-  },
-  "name": "FirebaseAnalytics",
-  "platforms": {
-    "ios": "8.0"
-  },
-  "source": {
-    "http": "https://dl.google.com/dl/cpdc/f0e97b03de33925b/FirebaseAnalytics-5.1.2.tar.gz"
-  },
-  "summary": "Firebase Analytics for iOS",
-  "vendored_frameworks": [
-    "Frameworks/FirebaseAnalytics.framework",
-    "Frameworks/FirebaseCoreDiagnostics.framework"
-  ],
-  "version": "5.1.2"
-}