Remove unnecessary catch-clauses for try-finally

src/core/ReactCompositeComponent.js

@@ -1001,8 +1001,6 @@ var ReactCompositeComponentMixin = {
         this._currentContext = nextFullContext;
         this.context = nextContext;
       }
-    } catch (e) {
-      throw e;
     } finally {
       this._compositeLifeCycleState = null;
     }
@@ -1164,9 +1162,6 @@ var ReactCompositeComponentMixin = {
     ReactCurrentOwner.current = this;
     try {
       renderedComponent = this.render();
-    } catch (error) {
-      // IE8 requires `catch` in order to use `finally`.
-      throw error;
     } finally {
       ReactContext.current = previousContext;
       ReactCurrentOwner.current = null;

src/core/ReactContext.js

@@ -56,9 +56,6 @@ var ReactContext = {
     ReactContext.current = merge(previousContext, newContext);
     try {
       result = scopedCallback();
-    } catch (error) {
-      // IE8 requires `catch` in order to use `finally`.
-      throw error;
     } finally {
       ReactContext.current = previousContext;
     }

src/core/ReactUpdates.js

@@ -79,9 +79,6 @@ function flushBatchedUpdates() {
   // Run these in separate functions so the JIT can optimize
   try {
     runBatchedUpdates();
-  } catch (e) {
-    // IE 8 requires catch to use finally.
-    throw e;
   } finally {
     clearDirtyComponents();
   }

src/core/__tests__/ReactCompositeComponent-test.js

@@ -737,8 +737,6 @@ describe('ReactCompositeComponent', function() {
       );
 
       NamedComponent(); // Shut up lint
-    } catch (e) {
-      throw e;
     } finally {
       console.warn = warn;
     }
@@ -780,8 +778,6 @@ describe('ReactCompositeComponent', function() {
         'createClass(...): `childContextTypes` is now a static property and ' +
         'should be defined inside "statics".'
       );
-    } catch (e) {
-      throw e;
     } finally {
       console.warn = warn;
     }